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Username Post: Fuse block supply wire        (Topic#359723)
Original58 
Contributor
Posts: 552
Original58
Loc: Manitoba, Canada
Reg: 10-30-13
02-05-20 07:10 PM - Post#2785982    

Hi
Im normally on the 58 forum but my son bought a 71 GMC 4x4 thats having an issue.
Previous owner swapped in a 92 5.7 tbi motor and 700r4 trans.
The issue is that it rsndomly stalls.
What I'm wondering is which wire supplies key on power to the fuse block. Im thinking there is a short somewhere that intermittantly cuts power.
Thanks
Jeff

1958 Biscayne 283 Turbo-Glide 31,000 mi (now 35,000 and counting) driven daily
1966 Mustang Inline 6- C4 57,000 mi and growing daily
1929 Graham - Paige 612- the eternal headache that I will never sell


 


CowboyTrukr 
"10th Year" Silver Supporting Member
Posts: 4489
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
03-15-20 12:07 PM - Post#2788700    
    In response to Original58

Jeff, did you ever get this fixed?

Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
Original58 
Contributor
Posts: 552
Original58
Loc: Manitoba, Canada
Reg: 10-30-13
03-16-20 05:11 AM - Post#2788746    
    In response to CowboyTrukr

Hi Greg,
Thanks for asking. Quick answer is I think so lol.
I could never duplicate it in the shop. I tested retested and changed a few things like iac, coolant sensor etc. It seemed to point to electrical but moving wires, plugs or testing components showed nothing.
I finally replaced the icm ( ignition control module) simply in frustration. Its worked 2 weeks so far without a hiccup. I had thought the egr was the issue since it randomly would stay open a bit, although I think that would cause a stumble. So the egr got blocked off.
In the end I think / hope the icm resolved the issue.
Thanks for asking.

Jeff

1958 Biscayne 283 Turbo-Glide 31,000 mi (now 35,000 and counting) driven daily
1966 Mustang Inline 6- C4 57,000 mi and growing daily
1929 Graham - Paige 612- the eternal headache that I will never sell


 
bry593 
Contributor
Posts: 831

Reg: 10-07-13
09-09-20 10:47 AM - Post#2803111    
    In response to Original58

For GM cars of the 60's & 70's, a pink wire is 12V+ when the key is on. That is GM's code. An orange wire is 12V+ regardless of key position.

So, your HEI 12V+ is pink, the 12V+ to your tach is pink, the 12V+ to your dome light is orange, 12V+ to your lighter is orange.... And so on, and so forth....



Edited by bry593 on 09-09-20 10:48 AM. Reason for edit: No reason given.

 
55 Shaker 
Member
Posts: 1561

Age: 71
Loc: north central IL.
Reg: 03-13-06
09-09-20 12:10 PM - Post#2803120    
    In response to bry593

Interesting, never knew that. Now I will go to bed tonight smarter than I when I woke up this morning.

The older I get, the more dangerous, I am !!!!


 
Original58 
Contributor
Posts: 552
Original58
Loc: Manitoba, Canada
Reg: 10-30-13
09-11-20 07:03 PM - Post#2803286    
    In response to 55 Shaker

Just to update. The icm ( ignition control module) was the problem. Its been working great since I changed it in march.

Jeff

1958 Biscayne 283 Turbo-Glide 31,000 mi (now 35,000 and counting) driven daily
1966 Mustang Inline 6- C4 57,000 mi and growing daily
1929 Graham - Paige 612- the eternal headache that I will never sell


 


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