Check your ground and make sure it is properly grounded ....it needs to be a very clean paint/gum free area tightly bolted. Next Check and make sure you are recieving your 12 volts (not running) 13 (running) by placing your test leads from positive to ground...... then make sure your power remote from your head unit is putting out voltage.
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Here are the troubleshooting steps for fuses blowing.
1) Remove all wiring except ground, power and remote and see if the amp powers up without blowing the fuses. If it does, the problem is in the input cables or speaker wiring.
2) The use of loudspeaker impedances below the recommended minimums will cause the amp to draw excessive current - check.
3) A shorted or grounded RCA cable may cause the fuses to blow - check. 4) If an amplifier fuse blows continually, with only +12 volt, ground and remote leads connected, the amplifier is probably defective, most likely shorted output MOSFET's. In this case the amp needs professional repair or replacement.
If your car battery was not disconnected when the amp was installed them your amp has blown, it could just be a fuse or at worst the circuits inside have fried. Check your fuses if not take it to a certified car audio shop and ask them to have a look at it for you. Need more information to help you bruv, but from what you have said it has been connected with the car battery still connected
To have 3 speakers bridged, each speaker must have at least a 12 ohm impedance (assuming that all speakers are connected in parallel). If you're running a load lower than 4 ohms (mono), the amp will likely fail.
The fuses don't blow right away because they are cold at first. As they heat up, they can blow more easily (even though the current draw hasn't increased).