hi im hoping some one can help me with this , i have fitted two amps in my car they are working fine , the car is a 03 plate octy vrs , the problem is the small fuse box on top of the battery keeps over heating and the alternator lead coming off it gets red hot and has set on fire once its a brand new part i have fitted , any help would be great cheers , oh yeh the amps are a pioneer 300 watt an a 760 watt

Are you using correct wiring for it?

yes mate i am , its a proper kit for the system , but its the cars wiring thats the problem , cheers for the reply

yes mate i am , its a proper kit for the system , but its the cars wiring thats the problem , cheers for the reply

You are trying to take over approx 88 amps from the cars electrical system if you were running at full power and that is an awful lot of current. I'm guessing that the amp wires should be coupled directly to the battery but it seems that the alternator (and/or battery) can't cope with what you are asking of it. Presumably it's worse when the lights are on as well? Check the alternator and battery and consider upgrades or ditch an amp!

Don't know about the amount of power (88A) but they are small amps to be causing that sort of problem.

In my GTE I ran 2 x Kenwood mono blocks 1200w and 1 x Kenwood 4 channel 600w with no problem.

In my Nissan Sunny (1.3 GS) I ran 5 amps with no problems.

All on standard alternators.

You have another problem there I think.

thing is its not the battery or alternator thats the problem is the wiring ?

you are not taking 88 amps from the car battery or Alternator! The amplifier wattage shown on the label is the maximum AC Audio wattage,not DC wattage it will take when on.

The amplifiers load varies ,as does the signal to it. You may momentarily draw high current when bass notes are playing. The load is not a constant Direct Current load ,like headlights. If you dont believe me put an ammeter in circuit. It sounds to me as if more current is flowing than the cable can handle,or a short in the amplifier. Is the fuseholder rated for at least 30 amps?. Fuses and fuseholders can get hot , if they cant handle the current flowing in the circuit.

Edited 27 November, 200916 yr by AndyPandy

Fuses and fuseholders can get hot , if they cant handle the current flowing in the circuit.

And catching fire indicates wrong cable rating being used - too low.

from the first post to now i have thought the same and it has been mentioned too. You are running a system using wiring that isnt correct i.e. a lower rating and possibly a thin bit of wire and not the correct rating wire. Go for a thicker wire and this will stop the wires melting and causing a possible fire or car malfunction.

In the meantime while you await to sort it out i would suggest removing all aftermarket wiring that you have done.