Question about 1987 GMC Suburban

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I have a 87 suburban 454, 2wd. the voltage gauge when i first get in and crank is about 13. this drops to around 8 the second time i go to start it the battery dont have enough charge to start it. the alternator has been replaced more then once? what could be the problem?

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Two obvious possibilities; The starter is binding, and takes all the battery has to turn it over, or...
There's a low-amp short draining the charge from the battery while the truck is parked.

Most electrical shops will do a complete system diagnostic for less than $20, be sure to let them know that you're looking for an ambient short.

The starter could just be gunked-up and need a good cleaning, but otherwise it's fine and can be's location makes it a good target for stray oil and dirt accumulation.

Posted on Jul 30, 2010


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