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Darn old truck!

O

olenmarmcr

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When i push my clutch in my voltage goes up. when i release it goes down. sometimes it goes all the way down to 8 volts. what the heck. any ideas? if i adjust the linkage to push the clutch in a little its not as bad. and if i unhook the linkage and move the pedal nothing happens so its not a short under the dash.
 
RPMs changing?
Does the voltage go back up when you rev the engine with the clutch out?
 
Oh, OK, that makes it easier.
Since I assume that the shaft of the alternator is not hooked up to the clutch, about the only way voltage can go up when you move something, it that you are either making a ground better, most likely, or you are moving a wire that makes a better connection to the hot terminal of the battery.
I suspect that either the engine block, the body, or the frame has a bad ground and when you press the clutch in, it completes a circuit.

J.
 
Ok, you need to check various connections. Check your battery to engine ground, battery to body ground. Add redundant grounds from engine to frame to body with cables from walmart (inexpensive, packed as lawn and garden cables by the batteries).

Then check your battery to starter, battery to alternator connections. Check fuseible link conditons on all cable runs. Check starter to distribution block, distribution block to fuse block connections. I had bad ring terming crimps in and out of the dist block, and was losing all body related power on my truck. Fixed, and EVERYTHING works better now.

If your truck is a mechanical clutch truck, i would bet on the dist block wires, but who knows. Check them all.

Good luckl!
 
so should i have a ground going from my battery to my body and my block? all i have is a ground from the battery to the block. Oh and a new thing started yesterday, when the truck is on all of the light inside and out flicker on and off every so often.
 
olenmarmcr said:
so should i have a ground going from my battery to my body and my block? all i have is a ground from the battery to the block. Oh and a new thing started yesterday, when the truck is on all of the light inside and out flicker on and off every so often.
Click to expand...

Sounds just like a bad connection somewhere.

Stock neg cable goes from battery to top of intake (on teh late 80's at least), and has a small wire from battery to core support.

There is a block to body woven metal strap, on the late 80's stuff its from the back on the passenger side to firewall. But it definitely doesn't hurt to run a ground cable from where the factory one attaches to the block, and run it to teh frame. Then run another one from that point to the body. Attaching securely and removing all paint, etc. at the connection points.


The wire that runs from the starter to teh distribution block on the firewall is attached with these:
348107.jpg


The crimped part was loose on mine, and wasn't making a good connection.
 
I had the electrical rat's nest under a truck I swapped to manual catch fire once... Every time I pushed the clutch in I was shorting it out, eventually I ran out of luck and it caught fire at a red light. I am not much tidier about my wiring :)
 
It worked, I had a bad ground. voltage stays at 14 volts now. Thanks for the help!
 
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