Voltage drop
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Freshman User
Joined: Aug 2018
Posts: 37
Likes: 1
From: Williamsport, Pa
Voltage drop
Hi! I have a 1970 F100, and it seems to have a voltage drop between the battery and the fuse block.
With the engine not running, I have 12.6v at the battery, but only 10.2v at the hot-when-on lug.
Can anyone please tell me what could cause this drop? I realize there are probably a lot of possibilities, I just need a good starting place.
When I tested that lug in the past, I had 12v.
Thanks!
With the engine not running, I have 12.6v at the battery, but only 10.2v at the hot-when-on lug.
Can anyone please tell me what could cause this drop? I realize there are probably a lot of possibilities, I just need a good starting place.
When I tested that lug in the past, I had 12v.
Thanks!
Thread Starter
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Freshman User
Joined: Aug 2018
Posts: 37
Likes: 1
From: Williamsport, Pa
That lug powers the hei dizzy, so I'm not getting 12v to the coil. It was recommended by the manufacturer to not use the existing 12v to the coil due to a voltage increase on startup.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
OK, maybe you know this already, the ballast or "pink wire" resistor is incorporated into the wiring harness on Fords. It's connected to the ignition switch with a bullet connector, runs under the dash, and then into a splice, by the time it exits the firewall and terminates at the solenoid starter relay it's just reg'lar wire. So I'm guessing here, but I think what needs to happen is you want to disconnect and/or bypass the resistor wire.
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