The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - can parasitic draw be caused by wrong bulb size?

andrewpclayton · 09-19-2017, 04:17 PM

I don't have a stereo yet, waiting to relocate the gas tank before I spend money on that. All I have changed that is remotely related to wiring is new light bulbs, added an edelbrock 1406 and cleaned up the rear light harness wires.
I did the test w the multimeter and the ground disconnected from the battery and red lead on the ground wire and black on the neg battery. the reading was around 12.7 which is about what it is when the truck is on. I removed each fuse 1 by 1 and no change.
The headlights tho are wired into a bolt on the frame by the battery then connected from there to the battery. this seems weird to me but I am brand new at this stuff and could be wrong.
when i disconnected that the reading went to 0 but the truck wouldn't start and the lights wouldn't work obviously.

09-19-2017, 04:17 PM	#3
andrewpclayton Registered User Join Date: Aug 2017 Location: Eugene Oregon Posts: 128	Re: can parasitic draw be caused by wrong bulb size? I don't have a stereo yet, waiting to relocate the gas tank before I spend money on that. All I have changed that is remotely related to wiring is new light bulbs, added an edelbrock 1406 and cleaned up the rear light harness wires. I did the test w the multimeter and the ground disconnected from the battery and red lead on the ground wire and black on the neg battery. the reading was around 12.7 which is about what it is when the truck is on. I removed each fuse 1 by 1 and no change. The headlights tho are wired into a bolt on the frame by the battery then connected from there to the battery. this seems weird to me but I am brand new at this stuff and could be wrong. when i disconnected that the reading went to 0 but the truck wouldn't start and the lights wouldn't work obviously.