Megashifter mystery
Thread Starter
Supreme Member

Joined: Feb 2004
Posts: 1,159
Likes: 2
From: Munster IN
Car: 92 RS, 05 GTO (sold), 10 TL AWD
Engine: 383 HSR w/DSC1
Transmission: 700r4
Axle/Gears: Strange S60/3.73
Megashifter mystery
Ok, so I am having to go back to school here. Let me lay out the story. I had my car half way re-done a few years back and since then it has sat in project hell (new story right?) Well I decided late this summer to perhaps get back at it. The car has a Megashifter installed in it.
I charged up the battery and after years of sitting the thing roared to life! Yay! short lived though....went out a few days later to back it out of the garage...nothing. Lights all come on like they should, but not a tick from the starter. Battery has full charge. This leads me to believe either a bad starter solenoid or a dead park neutral switch. Thing is I don't know enough about the switches that come on the Megashifter.
Another related mystery, I noticed that the second cable that used to be on the original shifter (not the kick down cable) is just laying on the floor, not attached. It releases when you turn the key to on. Right now I can actually move the shifter regardless of the key position. That can't be right. This cable I feel should be attached to shifter but there is no attachment points I can see. What am I missing here?
Thoughts on the no start being related to shifter? school me...thanks
I charged up the battery and after years of sitting the thing roared to life! Yay! short lived though....went out a few days later to back it out of the garage...nothing. Lights all come on like they should, but not a tick from the starter. Battery has full charge. This leads me to believe either a bad starter solenoid or a dead park neutral switch. Thing is I don't know enough about the switches that come on the Megashifter.
Another related mystery, I noticed that the second cable that used to be on the original shifter (not the kick down cable) is just laying on the floor, not attached. It releases when you turn the key to on. Right now I can actually move the shifter regardless of the key position. That can't be right. This cable I feel should be attached to shifter but there is no attachment points I can see. What am I missing here?
Thoughts on the no start being related to shifter? school me...thanks
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Joined: Aug 2009
Posts: 350
Likes: 1
From: WA
Car: 1990 Camaro RS
Engine: LT1
Transmission: 4L60E
Axle/Gears: 10 bolt, 3.73 Ratio, Torsen LSD
Re: Megashifter mystery
The only cable that attaches to the shifter is the one that runs to the trans. The other cable that is supposed to only let you start in P shouldn't be attached to anything. So you should be able to shift into any gear with out the key in the ON position. There is two switches attached to the driver side of the shifter. One is for reverse lights and the other is for neutral safety. They are interchangeable. If you are just trouble shooting you can swap them.
Thread Starter
Supreme Member

Joined: Feb 2004
Posts: 1,159
Likes: 2
From: Munster IN
Car: 92 RS, 05 GTO (sold), 10 TL AWD
Engine: 383 HSR w/DSC1
Transmission: 700r4
Axle/Gears: Strange S60/3.73
Re: Megashifter mystery
Really? So with the megashifter, it becomes almost like a manual in that there is no ignition lockout of the trans.....this is the first time I have ever heard this. What did most everyone do with this cable? Just leave it in the center console?
Member
iTrader: (3)
Joined: Aug 2009
Posts: 350
Likes: 1
From: WA
Car: 1990 Camaro RS
Engine: LT1
Transmission: 4L60E
Axle/Gears: 10 bolt, 3.73 Ratio, Torsen LSD
Re: Megashifter mystery
Exactly. I Just pushed mine a little further into the center console so it was on the carpeted part to prevent possible rattle. Essentially yes It is just left in the console.
Joined: Dec 2004
Posts: 2,042
Likes: 18
From: Lincolnton, NC
Car: 88 IROC
Engine: 97 5.7 Vortec LT4 hotcam
Transmission: 700 r4
Axle/Gears: 3.73
Re: Megashifter mystery
I completely removed that cable from my car.
One issue I have with my megashifter is the neutral switch. It doesnt get good contact. Sometimes I have to lightly pull the shifter handle to the driver's side. This gives a better contact and the car will start. I can actually here the swtich click when I do it. I hope I said that in a way you can understand. It is hard to describe.
One issue I have with my megashifter is the neutral switch. It doesnt get good contact. Sometimes I have to lightly pull the shifter handle to the driver's side. This gives a better contact and the car will start. I can actually here the swtich click when I do it. I hope I said that in a way you can understand. It is hard to describe.
Thread Starter
Supreme Member

Joined: Feb 2004
Posts: 1,159
Likes: 2
From: Munster IN
Car: 92 RS, 05 GTO (sold), 10 TL AWD
Engine: 383 HSR w/DSC1
Transmission: 700r4
Axle/Gears: Strange S60/3.73
Re: Megashifter mystery
I know what you are talking about. The switches are just mechanical limit switches that are activated by the two rivet type bumps on the side of the shifter. I actually clicked both switches on by hand since car has no center console right now. I got no effect. I will try swapping them just to be sure the one hooked to park/neutral is working. If still nothing I think culprit must be starter relay....
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Thread Starter
Supreme Member

Joined: Feb 2004
Posts: 1,159
Likes: 2
From: Munster IN
Car: 92 RS, 05 GTO (sold), 10 TL AWD
Engine: 383 HSR w/DSC1
Transmission: 700r4
Axle/Gears: Strange S60/3.73
Re: Megashifter mystery
haha, good question! Answer..no clue! This was installed as a part of a full drivetrain overhaul I had done by a shop. The car got all new motor, trans, Painless wiring harness, dual fan system, and this shifter. I then let the car sit for at least the last 3 years (bought a house that sucked up all time and money) and now able to start playing with the thing once again.
The shop that did this is out of business now so I am on my own in figuring this out. Like I said the car did fire right up no problem and ran for a few minutes, I shut then it off. 3 days later it was dead. All the dash lights flash like they should, fuel pump primes, but I don't even get a tick from the starter.
I have forgotten so much about these cars and their quirky electrical systems/components it's really sad. I just sold my GTO too so this is my only way of occasionally escaping the FWD commuter car hell I now live everyday. Just not sure where to start looking for the issue and park/neutral switch is where I decided to start my investigation......
The shop that did this is out of business now so I am on my own in figuring this out. Like I said the car did fire right up no problem and ran for a few minutes, I shut then it off. 3 days later it was dead. All the dash lights flash like they should, fuel pump primes, but I don't even get a tick from the starter.
I have forgotten so much about these cars and their quirky electrical systems/components it's really sad. I just sold my GTO too so this is my only way of occasionally escaping the FWD commuter car hell I now live everyday. Just not sure where to start looking for the issue and park/neutral switch is where I decided to start my investigation......
Moderator
Joined: Jan 2000
Posts: 20,981
Likes: 11
From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Megashifter mystery
If there's no relay, then the switch contacts are easily burned up.
Member
Joined: Mar 2005
Posts: 123
Likes: 2
From: orange county indiana
Car: 89 rs vert/88 t/a GTA
Engine: 355 tbi/350 tpi
Transmission: 700r4 w/megashifter/700r4
Axle/Gears: 3.73/???
Re: Megashifter mystery
having installed one of these a few months ago i can tell you the switches that come with these are garbage.my car will start in gear because the switch got stuck depressed in (completeing the neutral start circuit) and my reverse lights no longer come on when in reverse because the switch broke (it moves but doesn't click anymore). didnt use the relay but i hear they burn out relatively quick too. i d try some new switches or switching them out and troubleshoot from there.
Junior Member
Joined: Aug 2010
Posts: 12
Likes: 0
From: Tucson,AZ
Car: 1985 camaro
Engine: LT1
Transmission: 4L60E
Axle/Gears: 3:42
Re: Megashifter mystery
I installed a mega shifter,I don't have a relay,does anyone know where i can get the relay?I've looked and couldn't find one ,not even on the B&M site..
Member
Joined: Mar 2005
Posts: 123
Likes: 2
From: orange county indiana
Car: 89 rs vert/88 t/a GTA
Engine: 355 tbi/350 tpi
Transmission: 700r4 w/megashifter/700r4
Axle/Gears: 3.73/???
Member

Joined: Dec 2007
Posts: 475
Likes: 3
From: Minnesota
Car: '88 Iroc
Engine: Single turbo Vortec 5.7, Megasquirt
Transmission: Probuilt 700r4 3000 stall Vigilante
Axle/Gears: Moser 9" 3.25 w/True Trac
Re: Megashifter mystery
You can just use any bosch style relay. I have a Megashifter in my car as well as a couple friends and none of us use a relay for the P/N switch. No issues at all and I've had mine going on 5 years, 30k miles. The limit switches are definitely cheap though.
Joined: May 2009
Posts: 4,915
Likes: 40
From: Far West
Car: 1986 Camaro Z28 IROC-Z
Engine: 350 Tuned Port Injection, for now.
Transmission: 700R4
Axle/Gears: Posi - 3.23
Re: Megashifter mystery
Back from the dead. I burned up 2 relays already. How do I install without a relay?
Member

Joined: Dec 2007
Posts: 475
Likes: 3
From: Minnesota
Car: '88 Iroc
Engine: Single turbo Vortec 5.7, Megasquirt
Transmission: Probuilt 700r4 3000 stall Vigilante
Axle/Gears: Moser 9" 3.25 w/True Trac
Re: Megashifter mystery
On mine. I just ran the 12 ga purple solenoid wire right into and back out of the limit switch on the shifter.
Joined: May 2009
Posts: 4,915
Likes: 40
From: Far West
Car: 1986 Camaro Z28 IROC-Z
Engine: 350 Tuned Port Injection, for now.
Transmission: 700R4
Axle/Gears: Posi - 3.23
Joined: May 2009
Posts: 4,915
Likes: 40
From: Far West
Car: 1986 Camaro Z28 IROC-Z
Engine: 350 Tuned Port Injection, for now.
Transmission: 700R4
Axle/Gears: Posi - 3.23
Re: Megashifter mystery
What if I keep the reverse light micro switch and splice in a butt connector on the purple and yellow wire? Wouldnt that cause the camaro to start in all positions? Look below.
http://i1234.photobucket.com/albums/...ps866d9941.jpg
I also found out why the relays fail. The small white wire that is the bridge for the purple and yellow wire may be too small of a gauge to handle the current while cranking. Seems to be acting like a "fusible link". That is the same wire that has burnt up on me 2x's. On one of the pictures, you will see the fix i made by soldering a new piece of wire in place of the burnt one.
http://i1234.photobucket.com/albums/...psac55afcb.jpg
http://i1234.photobucket.com/albums/...ps7a2dd3da.jpg
http://i1234.photobucket.com/albums/...ps22916d83.jpg
http://i1234.photobucket.com/albums/...ps866d9941.jpg
I also found out why the relays fail. The small white wire that is the bridge for the purple and yellow wire may be too small of a gauge to handle the current while cranking. Seems to be acting like a "fusible link". That is the same wire that has burnt up on me 2x's. On one of the pictures, you will see the fix i made by soldering a new piece of wire in place of the burnt one.
http://i1234.photobucket.com/albums/...psac55afcb.jpg
http://i1234.photobucket.com/albums/...ps7a2dd3da.jpg
http://i1234.photobucket.com/albums/...ps22916d83.jpg
Joined: May 2009
Posts: 4,915
Likes: 40
From: Far West
Car: 1986 Camaro Z28 IROC-Z
Engine: 350 Tuned Port Injection, for now.
Transmission: 700R4
Axle/Gears: Posi - 3.23
Re: Megashifter mystery
What do you guys think about this, adding another relay that can handle more current?
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