what kind of wattage are u running? Cause 1 farad cap is only good for 1000 watts
In my 87 hatch i ran 2 1000 watt amps a crossover all hooked to a 1 farad cap and i kill my altenator
So luckly it was under warranty and got a new so now i have 2 batteries
1 deep cycle which goes to the 15 farad cap which the 4000 watt rms amp runs from and its pretty hard to kill the voltage now