Convertible Release Cable Switch
Thread Starter
Joined: Dec 2001
Posts: 9,937
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Convertible Release Cable Switch
This switch just stopped working. Tell me all I need to know in order to fix it.
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
Looks like the cable came loose from the latch.

Last edited by chazman; Jan 22, 2017 at 06:31 PM.
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
Is it possible the cable is stretched? I disassembled the mechanism, lubed and reassembled and it works with the tonneau open but gets hung up when I put the top down. I need to manually twist the spring to release the pin for the top. Is there an adjustment I'm missing?
Someone stop me before I order a new cable.
Someone stop me before I order a new cable.
Last edited by chazman; Jan 22, 2017 at 06:31 PM.
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
.....
Last edited by chazman; Jan 22, 2017 at 06:29 PM.
Joined: Nov 2007
Posts: 683
Likes: 4
From: Mountain Maryland
Car: 89 RS Vert, 89 Formula, 89 Bird
Engine: L03, TBI 350, none
Transmission: 700R4, 700R4, none
Axle/Gears: 3.42, 3.45, none
Re: Convertible Release Cable Switch
Try this thread:
https://www.thirdgen.org/forums/conv...tible-top.html
https://www.thirdgen.org/forums/conv...tible-top.html
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
Try this thread:
https://www.thirdgen.org/forums/conv...tible-top.html
https://www.thirdgen.org/forums/conv...tible-top.html
This picture may be helpful.

My arm goes up and down and is not at a 45* angle. I'll give it a look when I get home.
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
There doesn't seem to be a lot of tension on the cable. How is that possible? How could it be stretched on a 7K mile car?
Should I replace the cable? Or am I missing something?
Should I replace the cable? Or am I missing something?
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Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
New cable ordered.
If anyone other than two-if-by-sea and me are following this thread.
If anyone other than two-if-by-sea and me are following this thread.
Joined: Feb 2004
Posts: 1,941
Likes: 30
From: Levittown Pa
Car: 89 Iroc Convertible
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.27 Posi 9 bolt PBR
Re: Convertible Release Cable Switch
I don't see how the cable could be stretched.Is your lever angled the correct way with ther cable attached?
Thread Starter
Joined: Dec 2001
Posts: 9,937
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
It is. But it just seems like there is not enough tension on it to fully release the clip. I assembled it and tried 30 times already and each time had to release the top manually by crawling in the back seat to get under the tonneau. Not fun for a fat middle aged guy!
Joined: Oct 2001
Posts: 12,214
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Convertible Release Cable Switch
The bracket that's holding the cable housing could be bent a lil bit causing slack in the cable housing??
Re: Convertible Release Cable Switch
The only way a cable like that can really stretch is if the cable is coming apart. If a couple strands break it'd effectively grow longer until finally it breaks completely. But usually you'll feel it binding long before the cable gives completely.
Maybe it's just me, but it looks like the arm on your latch isnt in the right position relative to the hairpin. But then I haven't looked at that latch on my car in a decade, so who knows. My guess would be that if you cant find a damaged part, that it's not assembled or adjusted correctly, but I just don't know.
Maybe it's just me, but it looks like the arm on your latch isnt in the right position relative to the hairpin. But then I haven't looked at that latch on my car in a decade, so who knows. My guess would be that if you cant find a damaged part, that it's not assembled or adjusted correctly, but I just don't know.
Thread Starter
Joined: Dec 2001
Posts: 9,937
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
The only way a cable like that can really stretch is if the cable is coming apart. If a couple strands break it'd effectively grow longer until finally it breaks completely. But usually you'll feel it binding long before the cable gives completely.
Maybe it's just me, but it looks like the arm on your latch isnt in the right position relative to the hairpin. But then I haven't looked at that latch on my car in a decade, so who knows. My guess would be that if you cant find a damaged part, that it's not assembled or adjusted correctly, but I just don't know.
Maybe it's just me, but it looks like the arm on your latch isnt in the right position relative to the hairpin. But then I haven't looked at that latch on my car in a decade, so who knows. My guess would be that if you cant find a damaged part, that it's not assembled or adjusted correctly, but I just don't know.
It actually does feel like it's binding or something. The picture above on the red car, with the arm at about the 10:30 position can be be duplicated in my car when the cable/arm is in the full unlocked position. Otherwise it's at 12:00.
Then when I pull the switch, it's like the cable isn't able to return, and I have to disassemble everything again to get some tension. New cable will be in next week. It either fixes it or I blew 100 bucks for nothing.
Joined: Oct 2001
Posts: 12,214
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Convertible Release Cable Switch
What does the cable look like on the handle end?
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
New cable, no better.
Joined: Nov 2007
Posts: 683
Likes: 4
From: Mountain Maryland
Car: 89 RS Vert, 89 Formula, 89 Bird
Engine: L03, TBI 350, none
Transmission: 700R4, 700R4, none
Axle/Gears: 3.42, 3.45, none
Re: Convertible Release Cable Switch
Is there anything you want close-up pics of? There must be something that is not installed properly. My guess is the big hairpin. When I got my car, it had fairly low miles, but still, for whatever reason, had parts of the release mechanism that were missing, and I had to track down.
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
I'm wondering??? The only thing different is that I started re-gluing the back of the top, where the factory glue had failed. Is it possible the pin at the rear was slightly re-positioned by this?
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
Is there anything you want close-up pics of? There must be something that is not installed properly. My guess is the big hairpin. When I got my car, it had fairly low miles, but still, for whatever reason, had parts of the release mechanism that were missing, and I had to track down.
I'm wondering if it's not that hairpin looking spring?
Joined: Nov 2007
Posts: 683
Likes: 4
From: Mountain Maryland
Car: 89 RS Vert, 89 Formula, 89 Bird
Engine: L03, TBI 350, none
Transmission: 700R4, 700R4, none
Axle/Gears: 3.42, 3.45, none
Joined: Nov 2007
Posts: 683
Likes: 4
From: Mountain Maryland
Car: 89 RS Vert, 89 Formula, 89 Bird
Engine: L03, TBI 350, none
Transmission: 700R4, 700R4, none
Axle/Gears: 3.42, 3.45, none
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
So, it's not the cable. When you pull the cable switch, you can hear the pin pop, but it doesn't release all the way. You have to manually pop the pin the rest of the way.
Has the spring clip lost it's tension? Has that ever happened to anyone here?
Or is it related to this:
I noticed a torx screw is missing. Could this be enough to put the rear pin out of adjustment?
Sorry for the blurry pic.

I'm hoping Lon pops in for some guidance.
Has the spring clip lost it's tension? Has that ever happened to anyone here?
Or is it related to this:
I noticed a torx screw is missing. Could this be enough to put the rear pin out of adjustment?
Sorry for the blurry pic.

I'm hoping Lon pops in for some guidance.
Joined: Dec 1999
Posts: 5,964
Likes: 37
From: Hacienda Heights, CA
Car: 90 RS 'Vert, 88 IROC-Z, 88 Firebird
Engine: 305 ci tbi, 305 ci tpi, 350 ci tpi
Transmission: WC-T5, WC-T5, 700R4
Axle/Gears: 3.45, 3.27, 3.27
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
I seem to be getting more tension when I mount it to the top hole.
Joined: Dec 1999
Posts: 5,964
Likes: 37
From: Hacienda Heights, CA
Car: 90 RS 'Vert, 88 IROC-Z, 88 Firebird
Engine: 305 ci tbi, 305 ci tpi, 350 ci tpi
Transmission: WC-T5, WC-T5, 700R4
Axle/Gears: 3.45, 3.27, 3.27
Re: Convertible Release Cable Switch
You are also causing extra wear on the cable because it isn't properly aligned with the hole it us being pulled through. Extra tension is not the goal, securing and releasing the tonneau pin should be your goal.
You mentioned that a screw was missing. As I recall there are only two of those screws that secure the tonneau pin to the underside of the tonneau. That could be the problem, the pin is cocked and not entering the hole properly. Also did you check the condition of the groove in the pin yhat the spring enters to latch the pin? And wear or burrs on that edge of the groove?
I have that pin available if yours is damaged.
Lon Salgren
Top-Down Solutions
Last edited by lonsal; Feb 9, 2017 at 10:26 AM. Reason: Added photo
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
Thanks Lon. Will look it over again when I get home.
BTW, the tonneau pin isn't missing a screw, the missing screw is in the frame as pictured in my poor quality pic. There is a little play in the frame top, which I'm wondering if is enough to put the pin slightly out of alignment.
BTW, the tonneau pin isn't missing a screw, the missing screw is in the frame as pictured in my poor quality pic. There is a little play in the frame top, which I'm wondering if is enough to put the pin slightly out of alignment.
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
So, it's not the cable. When you pull the cable switch, you can hear the pin pop, but it doesn't release all the way. You have to manually pop the pin the rest of the way.
Has the spring clip lost it's tension? Has that ever happened to anyone here?
Or is it related to this:
I noticed a torx screw is missing. Could this be enough to put the rear pin out of adjustment?
Sorry for the blurry pic.

I'm hoping Lon pops in for some guidance.
Has the spring clip lost it's tension? Has that ever happened to anyone here?
Or is it related to this:
I noticed a torx screw is missing. Could this be enough to put the rear pin out of adjustment?
Sorry for the blurry pic.

I'm hoping Lon pops in for some guidance.
Lon, would you have any correct replacement torx screws?
Joined: Feb 2004
Posts: 1,941
Likes: 30
From: Levittown Pa
Car: 89 Iroc Convertible
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.27 Posi 9 bolt PBR
Re: Convertible Release Cable Switch
If he doesn't I have it.I have 4 spare top frames for parts
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Joined: Feb 2004
Posts: 1,941
Likes: 30
From: Levittown Pa
Car: 89 Iroc Convertible
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.27 Posi 9 bolt PBR
Re: Convertible Release Cable Switch
No problem...I haven't had a chance to get out in the shed.Ill look over the weekend for the screw
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
Thanks! Better pic.
Thread Starter
Joined: Dec 2001
Posts: 9,937
Likes: 636
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Convertible Release Cable Switch
Was able to find the exact Allen screw and washer at my local hardware store today. All fixed!









