CK5
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1974 K10 Dirty Sancho

Saved from cruel and unusual punishment
I also figured out the truck won't shut off if the headlights are on. The dash lights have stopped working and the turn signal indicators are lit with the headlights on so something weird is going on.
 
Did you put LED bulbs in? That's like some of the problems I had in both trucks trying LED turn signals.
 
Did you put LED bulbs in? That's like some of the problems I had in both trucks trying LED turn signals.

negative, it's all OE.

Obviously the EFI is seeing 12v through the headlight circuit when the ignition is off. IIRC I found a 12v ignition source at the fusebox and used that for the EFI. I need to put a light on it and see if it goes hot with the headlights on/ignition off.
 
Did you put a relay in the fuel pump circuit?

:haha:

One of the things the Edelbrock tech had me do was put the 12V switched feed straight off the battery thru a switch. He said something about sometimes some of the factory switch wires can hold enough voltage after the key is off that the ECU won't full power off.

In general tho, I'm thinking you've got some sort of ground issue. With the Derale fan controller in the C10 if I pull it's ground off the battery somehow it comes on even with the key off and the coolant stone cold. Kinda reminds me of your situation and makes me wonder if you have a ground wire disconnected or loose somewhere.
 
Did you put a relay in the fuel pump circuit?

:haha:

One of the things the Edelbrock tech had me do was put the 12V switched feed straight off the battery thru a switch. He said something about sometimes some of the factory switch wires can hold enough voltage after the key is off that the ECU won't full power off.

In general tho, I'm thinking you've got some sort of ground issue. With the Derale fan controller in the C10 if I pull it's ground off the battery somehow it comes on even with the key off and the coolant stone cold. Kinda reminds me of your situation and makes me wonder if you have a ground wire disconnected or loose somewhere.

interesting but I'm not too surprised either. The gas gauge has never worked, it pegs full when I turn the ignition on. I wonder if there's a weird ground issue tied to that too.
 
interesting but I'm not too surprised either. The gas gauge has never worked, it pegs full when I turn the ignition on. I wonder if there's a weird ground issue tied to that too.
I wonder if you've got a ground disconnected under the dash.
 
Any updates on this wiring issue?



I was also curious what things you did in the valve train and exactly what cam did you pick?
 
Any updates on this wiring issue?



I was also curious what things you did in the valve train and exactly what cam did you pick?

No updates on the wiring, I just make sure the headlights are off before I kill the ignition :rotfl:

After the distributor came loose a few months ago, it started pinging so I parked it for a while. Recently I found some time to put a light on it and found the base timing too advanced so I pulled some timing out and it's happy again.

Cam Specs:
Comp Cam 01-451-8
230 int./236 exh.
0.547 int./0.547 exh.
112 LSA

The machine work was just the valve guides so I could use the viton seals, which are required under the smaller ID of the dual valve springs. They also trimmed the height of the guides for extra clearance and resurfaced the heads.
 
No updates on the wiring, I just make sure the headlights are off before I kill the ignition :rotfl:

After the distributor came loose a few months ago, it started pinging so I parked it for a while. Recently I found some time to put a light on it and found the base timing too advanced so I pulled some timing out and it's happy again.

Cam Specs:
Comp Cam 01-451-8
230 int./236 exh.
0.547 int./0.547 exh.
112 LSA

The machine work was just the valve guides so I could use the viton seals, which are required under the smaller ID of the dual valve springs. They also trimmed the height of the guides for extra clearance and resurfaced the heads.
Ok, thought that was the cam you used, so my next question was answered about the guides.
How are those 35s holding up?
 
The coopers are solid, I'm more concerned about the 12 bolt. I have to remind myself to be nice to it.
I have 50K on my 12B with it behind a big block and 4:56 gears. I think that they will take a little bit of abuse.
 
For years, my avatar picture was of my truck in a burn-out contest. But the Bent one gave me crap about never changing it. I would have to go find it on the computer.
I know you'll light 'em up.
 

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