Posted by jackinok on December 05, 2012 at 12:35:33 from (162.58.82.136):
In Reply to: truck eletric drain posted by OLarry from MD on December 05, 2012 at 09:13:53:
often how the dome interior lights works is they have power constantly,but no ground.door swtches and things supply the ground circuit. they do this simply because it requires much less wiring. it also a lot of times throws folks off when they are trying to check the circuits because you cant simply check from one side of bulb to the other with a meter when light is supposed to be on. if you have a bad switch for instance, trouble shooting by checking accross bulb socket with a meter will show nothing.check from one side of bulb to ground,if you show 12 volts there,and light is not working and bulb is good you have a bad switch normaly.there is a condition however where this type of circuit can cause a battery drain. that is if the switch or wire to switch has a high resistance short to ground constantly. this particular problem might not cause bulb to light,But it will bleed off power... and just fyi.. normal type 12volt bulb does pull about two amps. pull the bulbs from lights to check for this. bulbs themselves can act as fuses in the right conditions. and they will handle up to several amps before they burn up..other places to check,alternator,brake lights. I do not know if you have one, but a floor mounted light dimmer switch can cause weird problems also. rust dirt and things that get inside can cause high resistance shorts. and thats possibly your culprit if it has one.that would also be in the light circuit,and should stop when light fuse is pulled. i dont recall a auto circuit where dome and headlights are on the same circuit, but it is possible. normally they are seperate.
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