What to do when thermal led goes on and base off

It is hard to say. The sub-woofer has its own amplifier, although it is supplied the sound data from the main amplifier. It could have a problem with the battery power circuit (Sub-Woofer Amplifier Connector Pin 6, LIGHT GREEN/VIOLET) or it could have a problem with the GROUND circuit (Pin 2, BLACK/LIGHT GREEN) Or it could possibly not be receiving the signal from the main amplifier (Pin 7, BROWN/ORANGE "+"), (Pin 8, RED/BLACK "-"). Or it could be that either the sub-woofer speaker is blown, or the sub-woofer amplifier is defective.
There is also a "High Audio Mute" circuit that connects between the main amplifier and the sub-woofer amplifier.

U need to check the impedance of your woofers .If they are 4 ohm i would reccomend hooking them in series, which is the positive output of your amp will go to the positive of one woofer, the negative of that woofer goes to the positive of your other woofer and the negative goes to the negative output of the amp.If that amp is bridgeable this will give u a good bass and the impedance will be 8 ohm so your amp will run cool and stable

Hi...

I've contacted ADCOM before and they sent a pdf of the electricals

http://www.adcom.com/default.aspx

also try:

www.stereomanuals.com

Doesn't sound like anything is wrong. If the thermal light is on before you have the ground hooked up then the amp is probably getting a small amount of electrical ground from the shielding on the RCAs or its mounting to the chassis of the vehicle allowing the amp to "barely turn on" (not enough ground). I can imagine this would make the amp think something is wrong (ie: thermal light) . May I suggest that you do not try to turn any amplifier on without ALL appropriate wires connected correctly.

This often normal to get a pop as the power goes down. The amplifier goes out of balance as the power drops and it drives current into the speakers. This is a design problem and most amps don't even TRY to avoid it. Very large amps have relays that disconnect the speakers an instant before the power collapses to protect the speakers.

disconnect sub woofer , amp may reset and light will be steady , if so replace wireing to sub and sub its bad

What ohm is your sub running at. Sounds like your runnig your amp to low an impedance causing it to thermally shut down, when it cools a bit it turns back on. Either that or you have wires crossed somewhere. Check your wiring and make sure the load of the speaker does not fall below the rcommended ohm of the amp. Usually 4ohms mono and 2ohms stereo

the light with the power light(middle) is a blue/purple faint light try checking it out at night.The squiggy(as heat waves) will only light when the amps shuts down due to thermal protection(wait for it to cool). The bolt/yellow (short circuit) will light when there is an electrical overload in any of the wires(check +ve leads).

you may be running 2 low of ohm load

check the fuse box and make sure there is no loose connection there. also check the wire that feeds power to that amp. good luck