Question about 1999 Dodge Ram
The red is the power for the radio. Yellow is the constant power which keeps your tuned stations saved in the memory and keeps your head unit's clock running and on the correct time. This is universal color code for car radio's.
To check correct hookup, switch ignition off. Test the yellow wire on the car for power using a multimeter or connect a 12V bulb between the yellow wire and a proper ground point. If you get no power you either have the wrong wire, a blown fuse or the wire is disconnected/broken. Do the same with the red wire. Here you should find no power with the ignition off.
Switch on the ignition. You should now have power on both red and yellow.
Connect the wire that where you found power with the ignition both off and on(should be yellow) to the yellow on the head unit. The other would then go on the red of the head unit. With this type of hook-up the radio would switch off with the ignition turned off, but will still retain its station and setting memory and clock time.
It is permissable to connect the red and yellow from the radio together and connect them to the permanently powered wire.
This will enable you to use the unit even without the ignition switched on. The downside is forgetting to turn the unit off and getting back to a car with a flat battery the next morning.
Remember to connect a decent earth wire to the black coming from the radio. The grounding provided by the antenna alone is not recommended.
Posted on Aug 20, 2010
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Posted on Jan 02, 2017
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