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88 Formula aftermarket stereo issues.

88 formula stereo

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#1 redfalcon


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  • First Name:David
  • City:Mitchell
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  • Year: 1988
  • Make: Pontiac
  • Model: Formula
  • Engine: 350
  • Transmission: auto

Posted 4 weeks ago

Ok, so took out the ol stereo, as it wasn't working. Put in a new Boss stereo. After finding all the wiring diagrams. Put everything together accordingly. Stereo didn't work. So put a cheater in to go directly from stereo to fusebox. Still got no power. Might mention this is second aftermarket I have tried. Only thing that was workin on the original radio was the clock. Also have tried, replacing fuse, and even putting hookup into another fuse socket. Everything else on dash works as it should with no issues. Anyone got any ideas what I could be missing?








































#2 ZumpTA


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Posted 4 weeks ago

Check the power and grounds.


Red wire is "switched" 12v, yellow wire is "constant" 12v, black is ground.  There may be multiple grounds in the harness and the one your harness adapter is pulling from is bad.  If it is, you can just connect the black wire of the stereo to any screw/bolt running into metal or use another ground in the harness. 


If the "yellow" wire isn't getting power, it needs fed from something "always on".  You could tie into the red, but nothing can be stored, it'll be like turning on the unit for the first time every time.  If the red isn't getting power, it can go to a "switched" fuse, or, tie into the yellow (but then the radio will not go off with the key and you'll have to always turn it off).  On the other hand, you won't need to have the key on to use the radio.


Just those 3 wires though are all that is needed for any aftermarket unit to power up and retain settings.  One or more isn't getting power (or ground).

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