Have 2010 Silverado. battery goes dead randomly. had batt. alt and voltage regulator checked and all is good.
With a multimeter, check for parasitic loss. YOu can google how to do that and it will reveal any power losses when the vehicle is at rest.
Simply a guess here, but I see the year of your vehicle and that might coincide with the failure of any alarm system backup battery, often fitted inside any alarm siren. If you do indeed have such a thing fitted to your vehicle, and if it hasn't been changed in a few years, then try disconnecting it. What often happens is the backup battery in the siren reaches the end of it's life and can no longer store electricity. It begins to draw more current from the starting battery to top itself off, but it can't top itself off any longer, so it continues until the vehicle's starter battery is drained.
Anyway, that's just a guess. Do a parasitic drain test. You should be looking at no more than 0.03 amps. If much higher than this, then pull any alarm sirens off, then recheck. Then pull the stereo fuse and recheck. Keep pulling fuses until you find the one which brings the voltage down to that figure, then you've found your culprit.
Sep 22, 2013 |
2004 Chevrolet Silverado