Question about Cars & Trucks
You need to measure the parasitic load on the battery.Roll the driver's window down,shut the door,open the hood(disconnect the hood light if it has one).I let it sit for a few minutes to let anything automatic shut down,then use a clamp style ampmeter to look for a large load.If there isn't a large load,then move on to an inline ampmeter.You will have to disconnect the battery(preferably the negative post),and connect the meter inline between the post and cable.It is adviseable to use a battery disconnect between the cable and post to power the car back up,and connect the meter at the post and cable after allowing the car to power up,then open the switch/knob to allow current to flow through the meter.(this will prevent the initial surge from frying your meter or blowing the fuse).You should see less than 50 milliamps on a typical vehicl(maybe a little more if you have certain accessories like an alarm system).If you see more,pull one fuse at a time until the load drops off.A common parasitic load I have found on GM vehicles is the lighted vanity mirror(s).The switch doesn't always shut off,depending if the visor is up or down.This draws about 500 milliamps,enough to kill it in a couple of days.The largest draw I ever saw was on a GMC Jimmy-the rear wiper motor wasn't parking correctly,and it was drawing 16amps!
Posted on Dec 30, 2012
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Posted on Jan 02, 2017
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