Recent Posts

1

Electrical / Re: TCC lockup pin location

« Last post by bd on Today at 12:53:04 pm »

The purple wire (Ckt 420) supplies I+ to the TCC solenoid from the brake switch.  It routes through the firewall bulkhead connector as shown.  Is this the wire you are questioning?

2

Electrical / TCC lockup pin location

« Last post by frotosride on Today at 10:18:25 am »

Looking for where the torque converter lockup (+) purple wire pins in at the firewall. Honestly can't remember if it is a separate plug/connection or if it was originally on the main bulkhead for the fuse panel. It's been so long that I can't remember where I de-pinned it from.

1987 V10 Silverado 700r4

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Electrical / Re: 87 R10 dual tank pump issue and hot fuel module

« Last post by Captkaos on Today at 08:49:45 am »

When you say the left tank comes on, do you mean the fuel pump or?

This part is confusing to me, what exactly do you mean by this:

But I'm bypassing the solenoid valve for the fuel selection Only , it's still being used for the fuel gauge readings.

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Electrical / Re: 87 R10 dual tank pump issue and hot fuel module

« Last post by Ocho on June 09, 2026, 09:53:51 pm »

Left tank pump i should've said

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Electrical / Re: 87 R10 dual tank pump issue and hot fuel module

« Last post by Ocho on June 09, 2026, 09:51:23 pm »

Let me get those details for your. Thanks. The problem I'm having is a soon as I turn the key to on,  the left tank comes on regardless of dash switch position.

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Electrical / Re: 87 R10 dual tank pump issue and hot fuel module

« Last post by Captkaos on June 09, 2026, 03:51:42 pm »

I am going to have questions first for a better understanding. 
What issue are you chasing?
Was your truck spec'd for above 8500 GVW and has a Hot fuel module?

Those appear to be tan/white wires coming out of that terminal and it should not an issue since the are connected/spliced anyway.  What are the numbers on that terminal for Brown, Dk Grn, tan/white, X, pink, yellow and lt grn?
120 tan/wht = fuel pump relay
both in-tank pumps and the fuel selector valve
920 tan = left tank pump & selector valve,
921 gray = right tank pump & selector valve
150 blk = ground

The dash gauge switches between tanks by the selector valve. 
30 pink = gauge
930 pink/white = left tank sender
931 pink/black = right tank sender

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Electrical / 87 R10 dual tank pump issue and hot fuel module

« Last post by Ocho on June 08, 2026, 10:16:13 am »

I'm doing an LS swap on my truck with carburetor. I'm using the factory dual tank setup with the selector switch and fuel pump relay as original. But I'm bypassing the solenoid valve for the fuel selection Only , it's still being used for the fuel gauge readings. Here's my issue, and I'll include a picture. On my bulkhead connector there's a terminal that comes out with two tan wires. One goes to the fuel take selector switch on the dash and the other wire goes straight to the left fuel pump. This terminal activates with key on. Therefore, energizing the left fuel pump and eliminating the ability to use the tank selector switch on the dash. Question is, should there be two wires coming out of this terminal? Because I can't find any wiring diagrams that show two wires coming out. My other concern is perhaps this feeds to the hot fuel moduleal and it is defective, therefore allowing voltage to pass through the module and straight to the left tank. Been chasing this for a few days so any help is very appreciated

8

Members Rides / Re: 81 K10 Build

« Last post by Mike81K10 on June 03, 2026, 08:17:23 pm »

I painted the cross on the tailgate. Some outline by stencil and the rest by hand and air brush. Wish I had more in-depth air brushing skills to do intense air brushing.

Look forward to the other projects on the forum. Keep it rolling! You are all the best!

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Members Rides / Re: 81 K10 Build

« Last post by 87ChevyR10 on June 03, 2026, 01:21:03 pm »

Went on a 35 Mile drive today to check out the truck. I have not been driving it much or working on it, stay too busy taking care of my sick wife. The truck runs good, yet this was the first time in about 6-7 years that it has been on an interstate. The 383 Stroker has too much power to be used with he SM465 transmission. Down the road sometime, I would like to install a manual trans with overdrive gears.

All electrical works, even the cigarette lighter to plug in accessaries (I don't smoke). The fuel transfer with worked as well and all lights. The steering was not as tight as I would like, yet not real bad. I am thinking about taking it to get a dyno test/tuning done sometime in the future. Thanks for the input and help on my project.

I bought a trailer for the truck to haul when needed and a 2020 Ford F250 Super Duty to pull it when desired. My truck is a bit dirty in the picture.

Looks good to me! Put a lot of work in on it, thanks for the pictures and updates

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Members Rides / Re: 81 K10 Build

« Last post by bd on June 02, 2026, 08:40:13 am »

It's good to hear from you.  Thanks for the update. 
Your project turned out really nice!  I like your "God & Country" statement on the tailgate...