I got a stock ford JBL amp with no wiring diagram i need to know what wires are what i have tryed to test for the power wirer but no luck.

I have a GT amp..can I use it for ext. use...not for car Sudheesh, Calicut

Ok on most amps there are two sets of wire ports one for speakers & one for +12v,grd & 12v remote start if you look over each port it will say what port is for what wire if it is in a connector it gets slightly more complecated what you do is with a vm check from wire to chassis ground [like seat bolts] 12v with key off when you cet power isolate wire then turn key on till radio comes on then do the same test for 12v isolate that will be remote start then turn key off &check from the first wire to other wire for ground to find speaker wires connect a regular peace of wire to chassis grd & touch the wires you will here the speaker pop be sure not to hold the wire on long cause it will blow the speaker