Another, easier way to test circuits without the danger of burning
anything up is to use a battery charger which is protected by an
internal circuit breaker rather than the battery. The current will be
limited and the breaker will trip before any damage can be done. About
the only thing you can't test this way is the starter.
I always use this method when installing and testing a new wiring loom.
> Try wiring an old (but working!) headlamp bulb in place of the battery
> ground strap, three or four filamants in parallel if you can. That
> you encounter the fault it will just make the headlamp filaments glow
> brightness and not damage the loom. Switch on each circuit in turn.
> Normally working circuits (except the starter) will cause the
> glow with varying degrees of brightness, the bigger the load the
> which means less power will be reaching the load so wipers will run
> at all) and headlamps will be dim.
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