Re: Positive Ground
With the modern digital multi-meter set to voltage, you can connect either probe to power and the other to ground and it will still get an indication but it will also show if polarity is off by adding a minus symbol to the digital reading. A test lamp will still light up but it has to match the voltage it is designed for.
Tail lamp brackets should be well bonded to the fender or what ever it's attached to. Fenders with tail lamps should be bonded to the body and so on.
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