Question about 1995 GMC Suburban

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1995 Suburban Electrical: Battery is being drained.

The new battery was draining & the vehicle would not start. After jumping it a few times I then noticed that the dash electrical gauge showed sporadiac readings from 10 to 14. I replaced the alternator, after replacement the gauge continues to read the same.

The only after market addition is a power brake as the previous owner hauled a popup camper.

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  • lou-red Dec 30, 2008

    same exact problem....m...

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The alternator is usually the culprit when nothing else has been modified. However yo mentioned changing it. (actually the regulator inside the alternator usually fails and drains the bat when the engine is off) However there is a very common issue with mid 90's gm trucks, the brake switched go bad and cause the brake lights to stay on. Try lightly touching the brake pedal and see the lights go off after slowly releasing it. the fix is a new switch that fairly easy to replace . These are mounted on the brake pedal arm just above your foot.

Aside from these two issues, you will need to trace the problem to its source by taking items out of service one at a time by removing fuses. not that the engine computer and the radio will always draw power at start up and a tiny clock current thereafter. But there should not be anything else. The voltage guage is not very accurate in the dash. Use a volt meter to watch voltages unplug fuses until the voltage goes up. without the vehicle running, voltage should be between 11 and 12 volts on a charged battery.

And finally, check the grounding. There should be a ground strap between the engine and vehical body in addition to the battery cable. If this is broken or missing it will cause errant readings of voltage in the dash.

I hope at least one of these tips works out for you.

-FW

Posted on Jan 04, 2009

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