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1990 chevy truck electrical problem

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New User

Jul 8, 2009, 2:58 AM

Post #1 of 3 (4783 views)
1990 chevy truck electrical problem Sign In

I have a 1990 chevy 2500 with 350 with 80,000 miles .After about four days the battery goes dead. I have replaced the battery and have had the new battery load tested and tests ok. With a voltmeter between the battery post and positive lead I see a slight 12 volt draw (barely draws an arc) With meter in place I have removed all the fuses one at a time from fuse panel, and removed the fuel pump relay and still have the draw. All lights work properly so I don't think it can be a defective socket.

Hammer Time
Ultimate Carjunky / Moderator
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Jul 8, 2009, 3:11 AM

Post #2 of 3 (4774 views)
Re: 1990 chevy truck electrical problem Sign In

There is a procedure for finding a battery draw like that.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Anonymous Poster

Aug 30, 2009, 1:11 AM

Post #3 of 3 (4648 views)
Re: 1990 chevy truck electrical problem Sign In

check glove compartment light, it might be staying on

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