Weird couple questions

[76Blue_Beast]

Ive posted before about my wire harness that Ive had to replace. I have finally replaced this with my little brother. Now we have a problem; there is a really long light brown wire that has a little rubber booty the looks almost like the end of some headphones. We have no idea what it is for. Good news being the truck turns over and is getting fuel (replaced old filter), we figure we would check the coil for spark but cant find where it is located! I feel stupid for asking but my chiltons manual doesnt show it either as Ive read through it several times. We figured checking for spark would be the first thing to do. Starter fluid has already been tried too. Any help. I can get a pic if needed as Im at work right now. 76 gmc c25 3/4 350/350 Sierra Grande

Thanks,
Ken

[J Knight]

The coil is located on top of the distributor cap with hei ignition or if you have points ignition it is on the intake between the distributor and the carb. I hope this is what you needed to know.
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[76Blue_Beast]

ok I will send my little bro down and have him look. Lol we might have just been super tired last night that we kept over looking it. He said the points might be bad or the coil so Ill start to replace the small things. Do you have any idea what the long brown wire is for on the engine harness?

[J Knight]

Sorry, I wouldnt know about the brown wire. Post a pic so we can see it.

[rs72z]

Originally Posted by 76Blue_Beast

ok I will send my little bro down and have him look. Lol we might have just been super tired last night that we kept over looking it. He said the points might be bad or the coil so Ill start to replace the small things. Do you have any idea what the long brown wire is for on the engine harness?

Sounds like the wire for the brake warning light on the proportion valve. What year model truck is this? Just seen the year. Should have Hei coil is in the cap.

[76Blue_Beast]

The wire comes out on the passenger side of the engine harness. It is long too with a rubber booty on it. Its a 76 Seirra Grande 350/350. It is a brand new harness from American Autowire. Unfortunately they arent open today. It's a couple feet long though. My little bro is going to take a pic and send it to me so I can post it. Im at work lol so give me about 15 min or so and Ill add it to this thread.

Thanks for the responses everyone!

[rwhit57]

That brown wire sounds like the fan wire. If you have an HEI dist you just need the one wire(hot when the key is turned on) to the bat side of the cap.

[76Blue_Beast]

How do you tell if you have an HEI Dist? Sorry for the stupid questions.

[motornut]

coil in the cap is High Energy Ign
thinking fuel sensor wire

in the jimmy that wire was down the pass side, out from the starter wires,to where the arrow is,thats where the "ear bud"looking thing plugged in

[76Blue_Beast]

So maybe this wire is whats causing me to not be able to start it. It will turn but wont start. Hmmmm ok Im waiting for my brother to send me a pic to my work computer then Ill post. Ok ill check this out tonight and then update you all. Thanks guys.

[J Knight]

Originally Posted by 76Blue_Beast

How do you tell if you have an HEI Dist? Sorry for the stupid questions.

HEI has 8 plug wires and a big square cap on top that is screwed down. Points ign has a small cap with 8 plug wires and one big coil wire in the center going to the external coil.

[76Blue_Beast]

thanks you thank you for all these pointers. I feel like I'm getting to know my truck so well since Ive joined this site! You all are great! I love this site, everyone is so helpful and willing to trouble shoot everything for anyone. Thanks again. When I get hom Ill take a much better educated look now!

[ozark]

fuel guage wire

[76Blue_Beast]

cool thx! I'll get pics up as soon as I revive her from the dead. Then off to the trany shop for a make over lol.

[motornut]

fuel sender sensor won't affect it starting
but it would let you know when empty,does gas squirt

make sure you have 12vdc at the coil cap clip
got Spark?
fuel?
air?

[76Blue_Beast]

As soon as I get out of work we are going to check all that out. I know it has fuel because I had to change the filter due to a leaking hose. We were stumped on how to check for spark on an hei which is why we couldnt locat the coil in the first place. But everyone has explaind the differences and all so now we are going to figure out how to check for spark. Where or how would I check for air? My brother said maybe the points went bad. I dont know much about this stuff but he has a better idea. He just lacks computer skills so I research on here with you all! :-)

[76Blue_Beast]

Here is an update of the work I've done on the truck with the harness'

[motornut]

dam hope the cookin pics were before

[76Blue_Beast]

Two are before and the one is the results from us replacing the harnesses .
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