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Parasitic drain 1975

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Old 07-16-2017, 03:23 PM   #1
croaker
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Default Parasitic drain 1975

Looking for a drain on my 75. Using a test light it lights. Multimeter 10 amp scale .6 is this a large draw?
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Old 07-16-2017, 03:56 PM   #2
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Quote:
Originally Posted by croaker View Post
Looking for a drain on my 75. Using a test light it lights. Multimeter 10 amp scale .6 is this a large draw?
If you round it off to .5amps and use an 80 amp battery as an example, it will pull the charge down within a couple of days. A .6 draw is not normal for a C3.
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Old 07-16-2017, 08:02 PM   #3
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In my opinion that is way too much. I do not like it going over .200 amp.

In my experiences...a .6 of an amp draw would kill the battery overnight.

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Old 07-16-2017, 08:08 PM   #4
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Yes it doesn't take long Dub. I'm gonna get on it in the morning. I just had the tranny done a while back so I guess I'll look around under there for something obvious. Hopefully this won't take to much to correct.
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Old 07-16-2017, 08:15 PM   #5
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Keep in mind it can only be circuits that are HOT at all times and NOT those that get 12 volts when the ignition key is on.

So ti will not be your turn signals or wiper motor due to they work ONLY when the key is ON...BUT...circuits like your interior lights, alternator, alarm system, rear compartment glove box light,etc that can have 12 volts to them at all times to operate will be where you find the problem. ASSUMING that the car is correctly wired as designed and not modified.

KEEP IN MIND that IF you have a wire connected to the BAT terminal in the center of your fuse panel..THAT wire can be also causing the problem if it is operating an aftermarket component.

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Old 07-16-2017, 10:11 PM   #6
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Thanks Dub this car still pretty much stock, radio still Delco. Like I said I suspect something underneath.

Last edited by croaker; 07-16-2017 at 10:12 PM.
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Old 07-17-2017, 12:33 PM   #7
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Is there a factory alarm? My friends 76 alarm caused grief on more than one occasion.
With the amp meter hooked up the way you determined the draw, did you try pulling fuses one at a time to see if it was one of those circuits?
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Old 07-17-2017, 01:51 PM   #8
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Where is this block in the car?
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Old 07-17-2017, 01:52 PM   #9
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Here is the circuit
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Old 07-17-2017, 02:35 PM   #10
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With the 75, are the interior lights on that same 20A Tail circuit?
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Old 07-17-2017, 02:52 PM   #11
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I believe there on the 20 amp above it
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Old 07-17-2017, 02:53 PM   #12
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Separate ,cause the one on top burnt

Last edited by croaker; 07-17-2017 at 04:23 PM.
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Old 07-17-2017, 07:29 PM   #13
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I have no clue due to not enough of the wiring diagram is being shown so I do not know where the other two wires are going because I am at home and not have a wiring diagram here.

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Old 07-17-2017, 09:48 PM   #14
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I've pulled all the bulbs tail, side , backup and license plate. Examined the wire no real problems noted. The dash hasn't had any work done behind it. Still .6 draw. anyone has any input that could help me isolate this issue.
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Old 07-17-2017, 09:59 PM   #15
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It also looks like seat belt buzzer may be in this circuit too. Can I just unplug it or does it have to be there.
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Old 07-17-2017, 10:09 PM   #16
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The alarm relay and flasher should be in the jack compartment behind the passenger seat. You could try unplugging them to see if there is a difference.
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Old 07-17-2017, 11:36 PM   #17
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I will 75. I'm also thinking the seat belt buzzer under the seat.

Last edited by croaker; 07-18-2017 at 12:06 AM.
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Old 07-18-2017, 01:28 PM   #18
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O cool pulled two wires loose. Now if I can figure which one went where. I see another car with a. cutoff switch in the future. Not worth ripping car apart
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Old 07-18-2017, 06:54 PM   #19
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Old 07-19-2017, 06:09 PM   #20
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Did you get the power drain figured out yet???

That circuit 40 goes to your headlight switch and then also traces back to the sequence mobile in the back of the car.

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