Question about 1999 Chevrolet Tahoe

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Battery draw.99 Tahoe 4x4

The draw is something to do with 4x4. I disconnected neg battery cable, put test light in between post and light is solid! So I started pulling fuses.Light goes out when I pull fuse out. Checked wiring the best I could.Found a box under dash for brain of 4x4?? Thought that might be the problem. Has anyone come across this before??

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: po 751 code 99 tahoe

The solenoids are located in the transmission. There is one for the 1-2 shift point, one for the 2-3 shift point, and one for the 3-4 shift point. You have to drop the transmission pan to access them.

Posted on Apr 10, 2009

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OK this should be simple to locate - you will need a ammeter. Disconnect the negative lead on the battery. Connect the ammeter in series between the disconnect lead and the battery terminal and with everything off take a note of the current draw. Switch on an interior and note the extra current drawn. With everything off (door closed etc) check the current. Ordinarily this should be very low, perhaps just enough to keep the clock running and the anti theft system active. Open the fuse box lid and remove and replace each fuse in turn noting any change to the current reading. Each fuse corresponds to an electrical circuit and by a process of elimination you will hit on the culprit circuit, the one drawing current and killing the charge in the battery. Most times the guilty party is a glove box light that fails to go off when the glove box lid is closed, the problem here is that when the lid is closed you cannot see if it switches off as it should. If it is a short you will have to locate the break in the insulation and fix this. In the mean time you can assess if you can run the car safely without the offending circuit having its fuse left in, better to have car that starts than say having a sun roof that is temporarily out of action

Posted on Aug 17, 2010

John Fourteen Six

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SOURCE: 99 tahoe brattery drains overnight

You need to look for an amp draw not voltage. You are on the right track to finding the problem. If you meter has an amp function use that. Connect it in between the battery post and the cable end. Pull the fuses one at the time until the amp reading is gone and that is the circuit that is pulling your battery down.The amp reading you are looking for to pull down a battery over night will be in the 1 to 2 amps. It may not be so easy to see on a analog meter, use a digital if you can. I would start with the Radio, or any add on's such as trailer hitch wiring.

Posted on Aug 25, 2011

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