Another weird electrical thing....

Thatoneguy · May 18, 2018

So I just got new batteries in the old girl about a week ago. But apparently I had a parasotic draw happening. So I disconnected both grounds on the batteries, and tested amperage with the multimeter and it showed it was drawing about .14 amps. I pulled each fuse on the truck and watched to see if the draw went away. None of them did it so next I started thinking a their is a short somewhere. Can't find anything. Here's the kicker........... When the AC switch is on, and I touch a ground to a ground terminal, the AC pulley locks up. If the switch is off and I touch a ground caple to it's terminal, nothing happens. Is this supposed to happen?! Could this be my parasotic draw?

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Runningaford · May 18, 2018

"When the AC switch is on, and I touch a ground to a ground terminal, the AC pulley locks up".. In the electrical world where I live, that's potential difference between what should be 2 grounded points; which should be equi-potential; I'd guess you've got a ground missing somewhere.

The reason the switch in the off position does nothing, at least I'm guessing is because the switch is breaking that circuit.

genscripter · May 18, 2018

if you have weird electrical things happening, like power getting to things that shouldn't, then you have a bad ground somewhere. The electricity always finds a way, and if one ground is bad, it'll find a path through some other circuit, which leads to odd functionality. Check your climate control grounds under the dash for that AC problem. As for your amperage drain, it might be related, but probably not.

Thatoneguy · May 18, 2018

Runningaford said:
"When the AC switch is on, and I touch a ground to a ground terminal, the AC pulley locks up".. In the electrical world where I live, that's potential difference between what should be 2 grounded points; which should be equi-potential; I'd guess you've got a ground missing somewhere.

The reason the switch in the off position does nothing, at least I'm guessing is because the switch is breaking that circuit.

If I'm understanding your post, then I guess I should say it does the same thing when both grounds are hooked up to their batteries, also does it when only one is connected

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Thatoneguy · May 18, 2018

genscripter said:
if you have weird electrical things happening, like power getting to things that shouldn't, then you have a bad ground somewhere. The electricity always finds a way, and if one ground is bad, it'll find a path through some other circuit, which leads to odd functionality. Check your climate control grounds under the dash for that AC problem. As for your amperage drain, it might be related, but probably not.

Thanks I'll check that out. Anybody got some recommendations as to what else could do it? Like maybe common faults?

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genscripter · May 18, 2018

Honestly, you should check all your grounds. Electricity is weird. Once i had my dash light up weird on my VW, and it ended up being a bad tail-light ground. The electricity was working its way back up to the dash and making it glow.

Thatoneguy · May 18, 2018

Ugh. Anyone wanna earn a sixrack of beer? Lol

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retiredinhomer · May 19, 2018

Thatoneguy said:
So I just got new batteries in the old girl about a week ago. But apparently I had a parasotic draw happening. So I disconnected both grounds on the batteries, and tested amperage with the multimeter and it showed it was drawing about .14 amps. I pulled each fuse on the truck and watched to see if the draw went away. None of them did it so next I started thinking a their is a short somewhere. Can't find anything. Here's the kicker........... When the AC switch is on, and I touch a ground to a ground terminal, the AC pulley locks up. If the switch is off and I touch a ground caple to it's terminal, nothing happens. Is this supposed to happen?! Could this be my parasotic draw?

Sent from my Moto Z (2) using Tapatalk

I am assuming you are checking with the key off. If the a/c pulley is engaging when you are grounding the battery. then your ignition switch is passing current to the run ckt of the switch. Unplug a/c clutch connection and verify drain goes away. Then back check to the ignition switch.

Thatoneguy · May 30, 2018

So got new batteries, and the alternator is fresh, it still died overnight. I did notice that I left the AC switch on and left the truck overnight. That stupid AC is starting to become a common factor every time it's been dead. I also unhooked both ground cables and tested for milliamps going out and the multimeter showed .14... Is that within normal range of draw when motor is off? I pulled every fuse while the meter was on and that .14 never went away. Could a crack in a battery cable cause a parasitic draw? Anybody got an idea?

Another weird electrical thing....

Thatoneguy

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