My EZGO golf car has the usual six batteries (36V) in series - each 6V.
I need to add 12V headlamps to the front. My tester tells me what positive battery pole and negative pole to connect the hot and ground wires in order to get the 12V. So, I hooked the wires up and even inserted a switch in the hot line so as to be able to turn the lights off & on of course. They seem to work fine.
Then I discovered a neighbor with an EZGO, with factory-installed headlights. On his car, the headlamp grounds are connected to the metal golf car frame.
So, I went back and connected my headlamp grounds to the metal frame instead of the battery negative - now no lights. Yet, my tester tells me a reading of 12v, using the hot lead and ground lead connected to the frame ground.
So, if I get a good 12V reading on my meter why won't the headlamps light? When I then reconnected the headlamp ground to the negative battery pole, the headlamps light again! And of course my tester showed 12V too.
Should I connect the battery negative to the golf car frame? Would that then make the metal frame 12V negative, and light the headlamps? I didn't try it. I was afraid to.
Thanks - yes I am confused.