I have a Pioneer GM X862 car amp, with a constant red light on it. Also, it is supplying the subs with power, they are lightly vibrating but its not pushing like it should. No bass.

take speaker wires off amp if the lit is green then speaker are hooked up wrong or blown.

check the connection for the woofer(low ohms) the omhs cannot be less than the amp is used for make sure power with the power ad hase the wright gage size and ground is grounded perfectly

check the rca input leads are ok

flashing light could mean a few different things. 1- constant power may not be there. check with a test light or multimeter. should read around 12 volts. it would be a good idea to check all the power and ground leads. make sure u have a good ground. 2- bad sub. im assuming sub since its a monoblock amp. you can meter the subs. make sure the total ohm load is no less than 2 ohms. any lower the amp will go into protect mode. 3- bad amp. power supply may be bad. the newer pioneer amps are full of protection circuits. ive been a professional installer for a shop about 8 years and we sell pioneer. hope it helps.

REMOVE THE RCA INPUTS AND DISCONNECT THE SPEAKERS, THEN POWER THE AMPLIFIER UP WITH THS NO INPUT, NO SPEAKER LOAD CONDITION. IF IT STILL GOES INTO PROTECTION AND YOU HAVE VERIFIED THAT THE POSITIVE AND ESPECIALLY THE GROUND CONNECTIONS, ALONG WITH THE REMOTE CONNECTIONS ARE 100%, THEN THE AMPLIFIER WILL NEED TO BE SERVICED. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V

make sure you do not have the ground and power crossed or touching if that dont work then you have ground problems hope that helps if not your amp is at fault(replace it)

The amp should always light up showing you that it is powered and there will also be a red light that will light up if theres something wrong.Sounds like maybe the hot wire that goes to the amp isnt big enough to give the amp enough power.Check your positive wire and ground wire for tightness and make sure hot wire supply is big enough and also the ground wire is big enough and has a good ground.I hope this Helps you.Have A great day..

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there is a possibility that the current load is excessive nor there is a short circuit from elsewhere, do not try to install again a new fuse unless you are certain there is no shortages of any wire from inside the amp and throughout the system by physical inspection

also install the right value for your fuse meaning the right amp and voltage, high temp is an indicator of shortages and defective power transistor

Does the amp power up normally if you disconnect the speaker wires from the speaker terminals of the amp?

It's never a good thing to blindly short across a power source.

That's a 4-channel amp, not a 2-channel, which makes me wonder exactly how you have it hooked up to your sub. Is the LED light on the amp coming on? How many subs do you have hooked up to it, and how is it wired?