Yes a multimeter will show 12 volts, and not have enough amps. Run into this all the time at work. If you have an old 12 volt horn, hook it directly to the battery and hear what it sounds like, now hook it to your brake wires and see if it makes the same sound. Then maybe hook it to the trailer connector on the back of your truck to see what it sounds like. A little annoying if you have neighbors. I have a buzzer at work that is from a trucks low air system that takes some amps to work. Maybe use a blower motor or anything that needs some amps to work.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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