Lights all flicker. When I an in the cabin the head lights flicker. I want to test my fuses with a circuit tester.
Should the engine be running or will I be blown away?
Please help, I'm a newbie to car electronics.
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I would test with a test light, not a circuit tester. A test light uses the car's battery, a circuit tester has its own battery and basically test for connectivity.
When you look at the fuses, one side will be input and the other side output. If the fuse is good, you will have voltage at both sides, if the fuse is blown, you will only have voltage at the input side.
connect the clip to ground (unpainted part of the body, bolt that goes through the body, dash frame, basically anything metal) and touch it to the sides of the fuse. On a 'push in' fuse, you can touch the terminals through the top of the fuse.
I do not believe the issue is a fuse. With fuses, they are either good and it works, or they blow and it does not work. The only thing fuse related that would cause flickering is if the fuse is loose.
I would look at grounds or your headlight switch.