My audiobahn a1500hct amp blew all the fuses so i unhooked the subs and put new fuses in and they didnt blow but then the amp kept switching from the blue to red led??

what wattage are the subs and amp? if your subs are more wattage than your amp, your amp will blow fuses as cant handle the output to your subs. for example. you have 2 500 watt subs and a 300 watt amp, that is no good as amp isnt powerful enough. if you have 2 500 watt subs you need at least a 1200 watt amp to power them both. 200 watt more than the combined wattage of subs as amps should never be turned up to max as they tend to blow and overheat more quickly. 80% volume on amps is reccomended by installers and manufactures.

its probably something lose inside ur amp that causing the amp to ground out ur fuses every time

the output devices in your amplifier are shorted.
to confirm,unhook the speakers,and turn on the amp.
if the fuse blows,the amp has a short inside .

It sounds like you solved this one your self . It does sound like the switch has went bad, but also look for any lose or bad wires around the tail lights and the wire harness going to them.

Does it blow the fuse if you disconnect the RCA cables and disconnect the speaker wires from the speaker terminals of the amp?

Does it only blow the fuse after the head unit is switched on (only after remote voltage is applied to the amp)?

Disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up normally, the wiring and speakers need to be checked. If it still shuts down, the amp likely has blown output transistors.

Your "bumpin" may have killed the amps "bumpin" Was the amp secure when you were sliding? So wires are ok, and lights and finas running. You have power but no output..Check the settings on the amp, also the fuse. Something might be earthing itself to the amp as well.

Completely disconnect the amp and remove the cover. Look for anything that is discolored or burned.

Did you have one sub on each channel before the sub blew?

First thing is first. What subs do you have? Audiobahn makes several kinds of 12" subs. What model sub do you have?
Without knowing this, it would be hard to recomend an amp without knowing how much power your sub can handle. Audiobahn makes from very power amps that can put out up to 5000W RMS, but if your sub can not handle that power, then you will blow your sub.

try just hooking up a power wire and ground wire only. disconnect your subs from your amp along with the remote wire and RCA's. if you have some jumper wires or run a wire from the power terminal to the remote wire. YOUR amp should come on, if it still stay's in protection mode it might be shot... hope this was helpful, i couldn get my a2300hcx to come on and tryed this and it came on turns out it was my remote wire was bad of the head unit...