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Truck Has Killed Three Batteries In One Year...
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Question
mrsilv04
Vehicle: 2004 Silverado Ext. Cab 2WD 5.3 Auto., 48,500 miles.
I'm having a real hard time keeping batteries under the hood.
OE battery removed 8/2007 @ 42,400 miles, replaced with a battery from NAPA.
NAPA battery failed 6/2008 @ 48,250 miles, replaced with second battery from NAPA.
Second NAPA battery failed after 53 days and 575 miles, replaced with a third NAPA battery just a few days ago.
Had dealer check the electrical system in June, three days before first NAPA battery had failed. Was told that system was within spec. Dealer blamed my aftermarket radio for the problem, which has been in truck since I bought it. They claimed that XM radio was pulling 300 mA, and the draw "went away" when they unplugged the XM unit. A lame excuse, and I was dumb enough to accept it.
The local NAPA is upset with me for the number of batteries that I'm going through, and all that I can tell them is that the truck checks out fine according to the dealer.
Now that I'm on my third battery in a year, I'm digging a little on this problem myself. There are three aftermarket items on the truck, that draw power. The XM radio, a Tekonsha trailer brake controller, and a LED strip below the tailgate (brake/turn signals).
I unplugged the XM radio, and unplugged the trailer brake controller from the panel under the dash. I unhooked the negative cable from the battery, and put a test light between them. It lit up brightly. I grabbed my little $10 multimeter, set it to the 250mA scale, and used it, and it pegs the needle.
So, I'm pulling something over 250mA of parasitic draw, with the ignition off, and with the XM and trailer brake controller uplugged. I'm not sure what this means, but the test light has a "pulse" in it, that goes away when I pull the fuse on the radio. However, the brightness of the test light doesn't dim any from what I can tell.
What is considered an acceptable level of parastic draw for a truck like this? Whatever it is, I know I'm above it.
Any ideas as to where I should be looking? Start pulling fuses until I drop the level of draw?
Or should I simply take it back to the dealer, and ask them to start looking for the *real* reason.
I'm going to try and find someone with a meter that will go up to 10amps, so I can get a good measure as to the level of draw that I'm seeing, for future reference if necessary.
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