Quote:
Originally Posted by r3lapse
I bought a multimeter a long time ago, but I have no idea how to use it. I did some google searches and measuring the +12V wire seems easy enough. How would I measure the REM and ground, though? Also, why are there four wires when there are only 3 remaining inputs on both AMPS (12V, REM, and GND).
Thanks a lot for your help Dave.
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Set it to read 12V, place the black/- against a known good ground (not the wire you think is a ground on the stereo ... frame bolt or something).
Place the red/+ against the bare end of the wires. Verify what has 12V (could be ~10V to ~14V), that's your power wire. The ground wire should have under 0.25V (hopefully 0). Your remote wire is typically a very thin wire, used only to send a signal to the amps that the head unit is powered up.
I haven't wired up a system that used more than positive, ground, and remote, including multi-amp and capacitor systems.
Quote:
Originally Posted by Dave57
The meter will read negatively if the connections are reversed. The turn on wire would show a positive value when the radio is turned on or car is turned on. As for the other wire I wouldn't worry about something that's not needed.
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Turn on wire = remote wire in this case