The trick I used when I checked out the TR3 is I connected each circuit to
the battery via a spare headlamp. If it is a short to ground the bulb will
shine with full brightness. If it is working properly the bulb will glow a
little, a fair amount or not at all depending on the load.
Leave out the fuses and connect the lead from the bulb to the load side of
the fuse block and start testing away. If you get a full bright headlamp
start disconnecting lights or other loads. But you can check your brake and
tail lights just fine. Also the other lights on the car. For best results
check one circuit at a time.
If you have a volt meter (which I highly recommend if you are going to work
on any electrical system) you can check the voltage on the circuit. If it
is anything greater than a volt you won't burn up the harness when connect
it up with the fuse.
Wiper motor: when I checked my wiper motor it moved briefly and stalled and
the headlamp went bright. But the fact that the motor moved at all told me
it was OK but a voltmeter reading would have confirmed this if there was
any doubt.
Dave
In a message dated 4/19/2012 9:36:52 PM Central Daylight Time,
nafzigerg@yahoo.com writes:
> I'm slowly working my way through installing wiring harness (tr-3) and
> have
> received great help already from the list. I have one concern left, and
> that's when I finish and want to connect the battery and test the system.
> I'm
> afraid one little mistake I might have made could burn up the new harness
> or
> even a small part of it.
> Is there a safe way to test portions of it first or
> does one just turn on the power and wait for possible smoke? I've
> basically
> been very careful about transferring the new wires to the old
> guages/switches
> on the dash section and also using the old harness as a model to connect
> the
> new wires to control box/fuse box and other parts; along with diligent
> reviewing of a wiring diagram every step of the way.
> I'm fairly confident
> things will work out ok at the time of switching on but just wondered if
> others who've "been there" have any advice on using the electrical system
> for
> the first time.
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