...acc, and ground for a 1989 mustang I don't know, but what I always do is use a test light. If the key is off and you get a light, that's the battery wire. Then, whichever causes a light when in the ...
...usualy the ground from there they sell voltage testers at any car part store any wire with power when the key isnt on is the memory wire, wire with power only when key is on is the acc hope this ...
...key ON acc. With the key in the off position there should be No power. Basically, the yellow wire is used to turn the radio off & on. The RED wire is for the memory and power for the radio. In ...
...and the wire that requires 12 volt switched this will only appear when you turn your car key to acc position , it's normally a yellow or orange wire your looking for but check your models
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