Posted by Inno on December 05, 2012 at 10:33:56 from (206.172.0.204):
In Reply to: truck eletric drain posted by OLarry from MD on December 05, 2012 at 09:13:53:
Measuring the current draw might be a better way instead of measuring the voltage.
With the neg. batt. cable disconnected switch your meter to the amp setting and reposition the leads as required, most digital meters require that you move the positive lead from the volts/ohms setting to the amp setting. Then do what you have been doing, from the neg cable to the neg post of the battery. This will give you a better idea of how much current is being drawn.
So if you pull the lighting fuse the draw is gone but disconnecting the plug from the light switch does not make the draw go away. I'm sure there is probably more than one fuse for the lights so it is also important to know exactly which lights are run from the fuse you are pulling. That's where a service manual or wiring diagram come in real handy. Your owner's manual might also help in knowing what that fuse runs.
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