Audio Systems: wiring trouble, rca cables, watt amp


Question
"I've been reading for a couple hours now and cannot find a answer to
my problem(s) so here i am. well where to start. i have an a alright
pioneer deck, (factory door speakers)and then a old school 12" JL w0 with
a nice box and some stupid single channel 300 watt amp, and a nice two
channel 1000 watt amp, and they both have the l.e.d. troubleshooting
light, and well i get green on both of them when i have everything hooked
up and nothing whatsoever from my sub, and i use to have it hooked up
and everything was gravy, pretty fricken impressive with the 150 rms amp
on and yeah it was, but now ive gone through everything three times,
all the wire connections are good, all fuses are good, but there seems to
be something wrong with my deck or amps, or rca cables, heres what the
real deal is, what i found made my sub kick was when i had it on at a
low volume and thought i was gunna break it but i pulled out the rca
cables on the amp and i noticed a thump from the sub, but it wasnt any ol
thump there was beat to it, so i slowly pushed one rca cable end back
it and with just the tip barley plugged in it gets mono signal thru!!!
so i thought bad rca cable? or back connection so i pulled out my deck
and found nothing wrong, so i left it out and  ran to the store got a
nice new car audio gold plated monster cable and before running it under
carpet and trim - ect. i wanted a dry run, so i hooked it up to my deck
from the back and out the car door to my trunk to the amp and well same
fucking problem and i ran and bought two other brands at the same
store, then went to another store and bought 1 more, but at the end, before
i gave up i tried hooking up the other amp at a low volume and i got
the same frikken problem whats wrong here? could it be my deck or does
god just not want me to bump when im rollin?"

Answer
i'm thinking your's is like mine, i had to find some obscure menu to enable the sub output of the stereo. took me quite some time with my japanese translated to english owners manual, but i finally found 'enable sub output', now, every time i disconnect the battery for any length of time, i have to find that setting again inorder to enable subs. hopefully this helps,........