C100 wiring vs C207
#1
Senior Member
Thread Starter
Join Date: Apr 2003
Location: Christchurch, New Zealand
Posts: 500
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1989 Trans Am
Engine: 1989 305 TPI
Transmission: 700-R4
Axle/Gears: 2.77 10 bolt
C100 wiring vs C207
Hi all,
I'm splicing together two harnesses for my TPI engine project, one is a 1989 and the other is 1987. I'm doing this as I have all the original '89 harness except for the connector that goes through the fender, the ECM and C207. I have successfully joined the ECM connector and C207 from the '87 harness to the '89 harness except for a couple of things.
All I really have left to do is the wiring for the fuel pump and transmission clutch lockup. However according to diagrams I've seen for '89 and '87, the route these wires take seem different. In '89 the purple wire for the trans and two fuel control wires pass through the firewall connector, C100. In '87 these wires go through C207 AND C100, unless the diagrams I've got are wrong.
But, assuming they're right, why would you pass the same wire through C100 and C207? And, which route would be better, C100 or C207, or does it make no difference?
Thanks for any thoughts on this.
I'm splicing together two harnesses for my TPI engine project, one is a 1989 and the other is 1987. I'm doing this as I have all the original '89 harness except for the connector that goes through the fender, the ECM and C207. I have successfully joined the ECM connector and C207 from the '87 harness to the '89 harness except for a couple of things.
All I really have left to do is the wiring for the fuel pump and transmission clutch lockup. However according to diagrams I've seen for '89 and '87, the route these wires take seem different. In '89 the purple wire for the trans and two fuel control wires pass through the firewall connector, C100. In '87 these wires go through C207 AND C100, unless the diagrams I've got are wrong.
But, assuming they're right, why would you pass the same wire through C100 and C207? And, which route would be better, C100 or C207, or does it make no difference?
Thanks for any thoughts on this.
#2
Supreme Member
iTrader: (1)
Join Date: Oct 2001
Location: decatur IL
Posts: 1,056
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 iroc, 87 iroc, 89 iroc, 89 formula, 84 supra, 85 trans am
Engine: t\a motor 355 lt1 intake, t56,the works, 89 roc 427 sbc tt project
Transmission: to many to list
Axle/Gears: 9bolt 4:10 in the T/A
you are correct, the fuel and trans stuff does go through c207. i think the reason they used both c100 and 207 was because of the side the wires coming from. the fuel pump relay is mounted on the drivers side but they sent it across the back of the engine bay and through c207 (not much sense there) and the oil pressure switch for the fuel pump was on the back of the block in 87.
does routing matter. no, not as long as the signal reaches were it needs to go. i would pin the harness up like it is an 89 because that is what most of your harness is. if you need more pins for whatever connector, just go to the junk yard and cut the connectors off you need so you can use the pins.
also keep in mind you might not need the c100 pins for the emissions stuff and could use those pins for what you need.
thanks
does routing matter. no, not as long as the signal reaches were it needs to go. i would pin the harness up like it is an 89 because that is what most of your harness is. if you need more pins for whatever connector, just go to the junk yard and cut the connectors off you need so you can use the pins.
also keep in mind you might not need the c100 pins for the emissions stuff and could use those pins for what you need.
thanks
#3
Senior Member
Thread Starter
Join Date: Apr 2003
Location: Christchurch, New Zealand
Posts: 500
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1989 Trans Am
Engine: 1989 305 TPI
Transmission: 700-R4
Axle/Gears: 2.77 10 bolt
Thanks very much for your thoughts on this. I was beginning to think I'd asked an impossible question.
After a bit of thinking I decided to route some of the wiring through C207 instead of C100. It ended up only being about two, maybe three wires at the most. My reason for doing this is because the '89 harness is already out of the car so it's easier to work on. Also, if I have to route wiring via C100 I anticipate some grief running wires from the socket half of C100 down through behind the dashboard, since I have an 82 car and many of the C100 pins aren't being used.
I think this will work, as I have the engine wired up now on the garage floor and electrically it works perfectly. Just haven't started it yet.
After a bit of thinking I decided to route some of the wiring through C207 instead of C100. It ended up only being about two, maybe three wires at the most. My reason for doing this is because the '89 harness is already out of the car so it's easier to work on. Also, if I have to route wiring via C100 I anticipate some grief running wires from the socket half of C100 down through behind the dashboard, since I have an 82 car and many of the C100 pins aren't being used.
I think this will work, as I have the engine wired up now on the garage floor and electrically it works perfectly. Just haven't started it yet.
#4
Supreme Member
iTrader: (1)
Join Date: Oct 2001
Location: decatur IL
Posts: 1,056
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 iroc, 87 iroc, 89 iroc, 89 formula, 84 supra, 85 trans am
Engine: t\a motor 355 lt1 intake, t56,the works, 89 roc 427 sbc tt project
Transmission: to many to list
Axle/Gears: 9bolt 4:10 in the T/A
207 is alot easier to acces once in the car as well. besides, to everyone else, it is just the same wad of wires,
good luck.
good luck.
Thread
Thread Starter
Forum
Replies
Last Post
Glowsock
Tech / General Engine
3
01-09-2017 04:06 PM