My polk audi pa880 keeps blowing fuses, i know its not the wiring because i wiredd another amp which worked, what could be the problem

The fuse is in the smart junction block? What is amp rating of fuse? My thought, for testing, use a new wire for proper wire color with inline fuse at sjb to rear lamp. I looked at wiring diagram, appears to be more than one fuse, don't know which one is blowing, the amp rating would help. I can only help with testing.

Keeps blowing 10 amp fuse ?????/ Do you know how to test automotive electrical circuit's ? Do you know what cause's a fuse too blow ? Short to ground in that circuit. Viewing wiring diagram's for that fuse's circuit an testing with a DVOM - digital volt ohm meter is how to diagnose . Video's on youtube showing how to diagnose. The Trainer 40 When the compressor won compress

Replacing any fuse after it has blown ,your almost
guaranteed it will blow again

At least you know the circuit with the problem

Now you go to factory wiring diagrams, to see what that
fuse controls & do some testing

Have to have wiring diagrams,be able to read them & know
basic electricity & be able to test your vehicle,then you have
to be able to continue on with professional tools, once the fuse
issue is resolved, if the fuse keeps blowing every few days

You could have wiring issues,more likely inside the trans in the oily
environment ,you could have solenoid or module failure or mechanical trans issues

I would say you can't resolve at home,need professional help

You have a short circuit somewhere in the wiring. Either a cut or bare wire. If not, the headlamp is causing the short. Last resort, use a higher amp fuse (but this may compromise wiring system).

So what does the fuse that blows, protect?

You need a wiring diagram & start to test
the components most likely to cause a high
current draw & blown fuse.

Don't keep replacing it.

You know the fan control circuit works, but the
compressor doesn't stay on. Did you monitor
the compressor as the fuse blew?

May have a module for compressor & fan
If so one side failed
The compressor clutch could be bad

Have you tested the amps being drawn with all bulbs in the circuit. This can be done easily by the DIY with an amp gauge and a few feet of wire. compare the result to the fuse amperage.

DASH HAS A SHORT CIRCUIT.DASH NEED REPLACING BUT CHECK FOR SHORTS IN THE WIRES TO DASH.DONT PUT A LARGER AMP FUSE IN A CIRCUIT TO KEEP FROM BLOWING FUSE BECAUSE IF FUSE DONT BLOW WIRES GET HOT IN THE CIRCUIT THAT HAS A SHORT IN IT AND CAUSE A CAR FIRE.

bad wiring or faulty fuel pump

Hi, first off, check to see if there is anything else on the same circuit, e.g is everything else working with the fuse blown. The cigarette lighter is a favorite. If everything else is ok, use a a multimeter set to amps from the positive battery terminal to the heater motor input terminal (with a suitable fuse in line) to test the amps draw of the motor. You can then compare this with the fuse rating recommended and if it's greater than 2/3 of the fuse rating, then replace the motor. e.g 10 amp fuse 7 amps max loading, 15 amp fuse 10 amp loading.
Hope that helps Matt..

hmm. lt look like there are poor joints in your wiring specially the groung wire. check the diagram of your auto. check the unit diagram for which the fuse blows. usually the fuse blow when there is a short circuit. if you look around you will find it.
good luck
ehsan.