REM, what voltage does it carry?

7ender
10+ year member

CarAudio.com Elite
Question, what voltage does the REM carry? I'm trying to wire in a voltmeter, if I run the positive to the REM will I get a reading corresponding to my batteries voltage?

Obviously, I would prefer to run my voltmeter's positive input directly to my battery +, but then it would never turn off.

 
Meter should have 3 wires. Positive goes to source you're metering, ground goes to earth, and REM turns on the meter when the car turns on.

 
Some HUs have 5V REM and 12V REM, though you don't want to measure that voltage. Put the positive to the voltage you want to measure, such as your battery voltage. Ground to ground, and the third wire to REM. If you have a 2 wire, it will be powered by the positive connection, and will require an external switch to be turned off while not needed.

 
Some HUs have 5V REM and 12V REM, though you don't want to measure that voltage. Put the positive to the voltage you want to measure, such as your battery voltage. Ground to ground, and the third wire to REM. If you have a 2 wire, it will be powered by the positive connection, and will require an external switch to be turned off while not needed.
Or a relay...

 
Okay, that's what I wanted to know. Looks like it won't work then.

And yes, I only have 2 wires (pos/ground). I'm cheap and buying a crappy voltmeter that doesn't have an remote turn on.

 
Okay, that's what I wanted to know. Looks like it won't work then.
And yes, I only have 2 wires (pos/ground). I'm cheap and buying a crappy voltmeter that doesn't have an remote turn on.
Dude all you need is to wire up a relay with the REM wire from your HU and your golden...

 
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7ender

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