2003 Ram Quadcab stereo install

Ok i am not a novice but not a pro either, My ram has the standard stereo system in it. Headunit is the single cd system 6x9 front doors and 5 1/4 rears no satelites in the dash. I replaced all the speakers with new infinity speakers tested with the head unit only works fine.  Then wired in a 4 channel amp using the high inputs.(yes i know ,i should use some converters but i didnt). the amp is working. the rear speakers sound great but no output on the front channel and the protection is not on. the amp is getting the input , just no output.  I believe this to be an issue with the head unit. all wire ohmed out from the amp to headunit, no shorts or breakes. Is it possible for the out put to be to high on the head unit?

Thanks in advanced,

I would switch the high imputs around and see if the fronts work then and the rears quit.  That would tell you if you have an input problem.  If the rears still work then and the fronts don't I would check for a front speaker terminal that might be grounded.  If you have a grounded front speaker that might shut down the output to both fronts from the amp.

let me know what you find out, be glad to help you further

you may just have a couple of bad channels on your amp

Grounding those wires should have no effect at all.  Touch them to metal and you will see, nothing happens.  But I referred to the wiring diagram for the high inputs of the amp, where if you were wiring for a common ground system the wiring is different than wiring for a floating ground car.  When you said you disconnected the ground wire on the input connector, it made me think you may have wired according to common ground.  So if you have tested each of your leads connected to the car's speaker wire harness for the proper speaker position and polarity, and have them connected to the correct wires on the high-level input plug,  then the high-level input on the amp may not be doing its job properly.  Which is why I, from my bad experience, would just use a separate LOC right from the start.

I looked again at your question.  Should you connect those ground wires?  Doing that should make no difference either, and wouldn't hurt anything if you did.  But not necessary.