Re: draining battery
Your best tool for troubleshooting current draw from the battery with the engine off is a test light connected between the removed battery cable clamp and battery post, either one/color, incandescent light bulb doesn't matter the direction of current.
The light bulb will only allow the amount of current to a max of brillance of the bulb used. If there is a short, the bulb will still shine because of the limited amount of current needed to glow.
Now, getting back to troubleshooting. Insert a test light and look for the glow, the lower the brillance, the lesser amount of current flowing. PCM's, aftermarket stereos, aftermarket amplifiers, GPS's maybe, cell phones, etc., whatever is plugged in, draws current fo memory purposes/functions, i.e., clock, station presets, equalizer presets, etc.
Install the test light and start unplugging everything one at a time and observe the glow. The lesser the glow, the lesser the current drawn. Sometimes, you may have to observe the light at night. A very small glow indicates only the radio & PCM are drawing current. All other aftermarket accessories draw too much current.
After the fault is localized, you can use a DMM in the amperage postion and replace the test light to observe the amount of current drawn. Any amount under 100 milliamperes, 0.1 amps, is good.
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