Posted 26 June 2018 - 08:22 PM
Use 12v automotive fuses(they're clear glass)
I'd disconnect all output circuits(indicators, heater etc) for that fuse. Then connect each circuit in turn, when the fuse blows disconnect that circuit.
For example you connect the reverse light then indicators, which then blows the fuse.. you'd then reconnect the reverse lights and then disconnect ALL indicators at the lights...
Fit a new fuse, does it blow? If not you've found the circuit with the fault.. now connect the indicators one by one waiting a couple of minutes to see if it blows.
Once you've found the fault you now need to clean earth's or love connections as needed