Electrical and Harness Repair Parts

KingBowzer

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South Carolina
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Joshua
Truck Year
1986
Truck Model
C10
Engine Size
350
One thing I'm curious about is, it seems that I have an additional positive cable. I have the battery cable, the alternator connector, the eyelet that goes on the back of the alternator, and the line that runs to the starter, but also an additional eyelet piece that looks like it goes onto a stud or bolt or something. As you may notice, I suck at wiring/electrical lol

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AKguy

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Alaska
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Randy
Truck Year
1981
Truck Model
K30 Crew Cab Silverado
Engine Size
460
Wanted: Wiring Harness

Oddly enough it wouldn't let me post this in wanted I would like to buy a complete wiring harness for a 1989 C3500 (Square body crew cab).

I cannot give enough praise to the folks at American Autowire. I used their complete upgrade kit for my daughters 1969 SS 396 Chevelle, and I just received a replacement engine harness for my 80/81 C20 to K30 project. Their products and support are incredible. Yes, they are not inexpensive, but well worth the coin.
 

Scott91370

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Burleson, Tx
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Scott
Truck Year
1982
Truck Model
Sierra1500
Engine Size
350
Hoping someone might be able to give me a hand....it seems my marking and labeling for wiring harness on my 86 C10 has been washed away during my teardown and rebuild. Truck has been swapped from stock 305 to 350, 700R4(I believe I dont have RPO in front of me) is now a th350. From the fusebox (in the engine bay) how is the wiring harness routed? It runs under the brake booster across the firewall, where does it go from there?

I just did this exact same thing - 305->350 and 350->700r4.
I can take some pics but I actually wasted a lot of time putting all the wires in loom so I don't know how well the pics will turn out. I'll try and get them tonight so you can at least look at them.
 

KingBowzer

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South Carolina
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Joshua
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1986
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C10
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350
I just did this exact same thing - 305->350 and 350->700r4.
I can take some pics but I actually wasted a lot of time putting all the wires in loom so I don't know how well the pics will turn out. I'll try and get them tonight so you can at least look at them.
I appreciate the response, but i was able to get it figured out luckily. I have it run along the left top ide of the intake, down between the alternator and cylinder head, and from there the starter cable runs beneath the motor mount and the rest runs to the battery. It was a pain in the ass, but it eventually got worked out. Half the problem was me being exhausted and frustrated with this truck lol

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Scott91370

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Sierra1500
Engine Size
350
Glad you got it. It is a pain when you start trying to figure out why some wires are so long and why they were put where you 'think' the factory should have put them.
 

AuroraGirl

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Northern Wisconsin
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Taylor
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1978, 1980
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K10, K25
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400(?), 350
keep in mind mine is definitely not stock, but stuff probably is going generally where it went originally maybe. And if its not, its probably why it has frayed or broken parts to it

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GMDiesel

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California
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Julian
Truck Year
1984
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K5 Blazer
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6.2L
Hello Everyone,

I'm new here and I may have skimmed through to fast... Anyone got any tips on where I can get a new wiring harness for my glow plugs? I bought a 84 K5 Blazer with a 6.2L diesel that was mickey moused like crazy and I'm thinking about running through and replacing all the wiring.
 

Matt Frediani

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California (Nor-Cal)
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Matt
Truck Year
1987
Truck Model
GMC V2500 Camper Special
Engine Size
TBI 5.7 350
Does anyone make a factory style harness for a 87 gmc v2500 with a TBI 5.7 350? I would like to replace mine.
 

jameshwilson

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Location
Rome, Ga. 30165
First Name
James
Truck Year
1985
Truck Model
C30
Engine Size
6.2 Diesel Convertered to 7.4L Gas
Hi, New to the Forum. I have a 1985 C30 Crew Cab. It was born with a 6.2 Diesel and has been changed over to a 454 Gas Engine. I am trying to clean up the engine Bay. The wiring is a mess. I am putting the wiring in the flex tubing and making repairs to connectors and damaged wires. Unfortunately, I got out here one day, and starting taking things apart. The one time that I did not take before pictures. I cannot figure the correct wiring for the 2-Pin Block on the Firewall and the 3 wire Internal Regulator wiring. There is every video and picture on the internet except the one I need. Could someone out there assist me in getting this truck wired back correctly, with Alternator Charging and guage working, as all was working great before I started. I have something incorrectly wired. Thanks.
 

Scott91370

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Burleson, Tx
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Scott
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1982
Truck Model
Sierra1500
Engine Size
350
...as all was working great before I started. I have something incorrectly wired. Thanks.
Welcome aboard!!! Go here and look at the first two posts, they're stickies so they are at the top.
Wiring diagrams and service manuals - they will help tons!!

 

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