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Old 05-24-2010, 10:06 AM   #1
jmag86
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Question Power to fuses??

Hey I have an 86 c10 and I'm not getting power to 3 fuses on fuse box. First s a 5 amp fuse that's marked instr lps. The second is a 20 amp fuse marked horn dome. And the third is a 20 amp fuse marked t/l ctsy. All three are not getting power where can I start looking to fix this problem and are all three inked some how to the same power source? Thank you in advance for the help!
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Old 05-24-2010, 11:16 AM   #2
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Re: Power to fuses??

Here's a wire diagram for an 85, it should be similar. Just follow the red wires from the battery to the fuse box. One of the connectors may be bad.
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Old 05-26-2010, 09:33 PM   #3
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Re: Power to fuses??

Hi jmag86,

I agree with VetteVet ... trace those red wires back from the fusebox to the battery looking for bad connections along the way.

According to the wiring diagrams in the GM shop manual I have, there are two of those red main feed wires that pass through the bulkhead connector on the firewall. That'd be a good place to start looking. Especially since one of those wires feeds the three fuses you mentioned. It's the red wire located in one of the outside corner slots in the connector.

The other red main feed wire is over in the next row (nearer to the center of the bulkhead connector). It feeds the ignition switch and some other fuses.
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Old 05-26-2010, 11:13 PM   #4
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Re: Power to fuses??

Hey thank you for breaking it down where I understand better, I have another question and excuse me for my ignorance, but what is the bulkhead connector?? Is that another name for the back of the fuse box on the firewall side where the wire come out?
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Old 05-27-2010, 12:08 AM   #5
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Re: Power to fuses??

Hi jmag86,

You're welcome.

Yeah, the bulkhead connector is right behind the fusebox where all the wires come through the firewall.

If you look closely on the underhood side of that connector, you'll see a small bolt head (about 3/8" if I remember correctly). That bolt secures the connector and will usually pull it apart some as it's unscrewed.

The underhood side of the bulkhead connector has 3 plugs that all sort of interlock and then plug into the socket on the firewall. One plug has wires that run to the lights at the back of the truck. Another plug has wires that run to the lights up front. And the remaining plug has wiring that goes to the engine ... the red feed wire you're looking for will be on this engine harness plug.

Sometimes the terminals on the underhood plug get pulled out of the plastic housing enough so they no longer make contact. If that's the case, it'll be pretty easy to spot once you unplug the bulkhead connector. Otherwise, examine the terminal in question for signs of corrosion or other problems.

Note that it's normal to find a bunch of gooey grease inside the bulkhead connector ... it's there to help keep out moisture.
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Old 05-27-2010, 07:44 AM   #6
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Re: Power to fuses??

Hi Ray-Mcavoy,

Hey thank you, I am going to start hunting it after work this afternoon. If I have any more questions hopefully I can get ahold of you! Thanks again!
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Old 05-27-2010, 08:18 AM   #7
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Re: Power to fuses??

Ray is this you-----http://rmcavoy.freeshell.org/index.html
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Old 05-27-2010, 09:17 PM   #8
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Re: Power to fuses??

I am sorry guys, but I looked and I am not understanding what the bulkhead connector is? Does someone have a picture maybe?
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Old 05-29-2010, 08:00 PM   #9
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Re: Power to fuses??

Hi VetteVet,
Yes, that's my website.

jmag86, Here's a pic of my dad's 77 taken during the restoration. The bulkhead connector remained pretty much unchanged (in location and looks) over the years so your 86 should be very similar. There'll be more wires though since the headlight harness wasn't installed in this pic.

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Old 05-30-2010, 04:40 PM   #10
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Re: Power to fuses??

Thank you vette vet! I'm going to start looking!!
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