A brother-in-law of mine, who lives 50 miles from me, brought a full size Chevy conversion van to my shop. Something was draining the battery and he'd had it to two different shops in his hometown and nobody could figure out why.
As I'm sure most of ya'll are aware, on a conversion van you have no clue as to how they might be wired. I confirmed with a meter that there was about a two amp constant draw on the battery. Checked all the light switches I could find. Nada. Finally started pulling fuses. When I pulled the fuse for the circuit the horn was on, the draw went away.
I checked the horns, and found the wires unplugged off of them. Touched one of the wires to the horn and the horn tooted. I began thinking maybe I hadn't heard the entire story. I pulled the steering wheel and found the horn button broken and shorting.
What had happened was the horns had stuck and my BIL unplugged them. That shut the horns up, but didn't de-energize the horn relay, which was what the draw on the battery was. Once I fixed the horn button, all was hunky dory.
I decided it must have been a good horn relay to remain energized continuously for a couple of months.
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