A few weeks ago I posted this...

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So I am doing my own install for the first time, and I can't get my
amp to turn on. Any suggestions would be much appreciated because at
this point I am clueless. Here are the clues, and to me they seem
contradictory.

1) The amp does turn on when I touch a small wire from the power input
to the remote turn on input on the amp (WHEN THE REMOTE TURN ON AND
POWER ARE CONNECTED TO THE AMP).

2) THe amp DOES NOT turn on when I do above but I disconnect the
remote turn on lead from the amp.

3) The first clue makes me think its the remote turn on wire.. but I
measured the remote turn on with a multimeter and when the radio is
off it measures 0 and on it measures around 12V just like it should.

4) I have measured the power wire.. its getting a little less than
12V.. like 11V.. seems like it should be enough.

5) I have checked the ground wire.. it is grounding the same amount of
voltage the power is feeding.

6) I have another amp... connected it.. same thing.. no power. I had
this amp connected initially and have not monkeyed around with it like
the other one. So I haven't tested it with the little wire between
the remote and power on the amp.

So if it isnt the power, isnt the ground, isnt the remote, isnt the
amp then what the hell is it. Obviously it has to be one of the
above, but right I am out of ideas. Thanks in advance.

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After this I put the amp in another car and it also didnt work. I
replaced the amp and cool everything works. I have a 2 amp system..
running on 4 gauge split to 8. Everything was working fine for a
week, I drove somewhere and everything was fine.. got in the car to
leave and now neither amp will turn on. EXACT SAME SYMPTOMS AS OTHER
AMP! REM is fine, power is fine, ground is fine, all measured with
multimeter, and it powers when i touch the power to REM.. no changes
to system! It just stopped working in that half hour time span that
my car was off! Did I just fry 2 amps? What the heck could be
causing this? I think I am going to cry now, as I have no other ideas
of what to do

Here are some specs...

Phoenix Gold 500 W mono amp
Pioneer 480W 4 channel amp
4 gauge power split to 8 gauge with Stinger fused distro block
8 gauge ground wire maybe too long? one piece is 4 ft and one is 5
honda accord v6 100 amp alternator