subwoofer problem

[4banger_ranger]

i have a 10' pioneer sub in my truck in a box with an amp< i hooked everything up right and it blows the fuse that work the speedo and turn signals when i turn the ac on. could it be caused from the previous owner not properly installin the aftermarket radio or a short somewhere??

 

[RonD]

Unhook the amp in the sub and see if the fuse blows.
Radio is probably hooked to that fuse which is fine, unless you add more power requirements, i.e. the subwoofer amp

Depending on that amps wattage you may need to install a direct 12v and ground with it's own fuse rated for that amp.
And then use current "Radio" 12v wire for a relay on the new direct 12v line this activates sub amp only when radio is on, so sub amp won't drain battery.

Look up the amps power rating for the correct fuse size, wire size and relay rating
Relays are designated by activation voltage and the amps it can safely pass, so a 12v 20A relay is activated by 12v and when contact close it cam safely pass 20amps
The relay itself, when closed, draws less than 1 amp

 

[4banger_ranger]

took sub and amp out today and it still does it

 

[RonD]

Just so I understand:

When radio is off and A/C is on fuse will not blow.
When radio is on and A/C is off fuse will not blow.

When radio is on and A/C is on fuse blows.

If this is correct then you need to move the radio power to another circuit, or even better add your own inline fuse for radio and sub amp.
Make sure radio doesn't have a separate amp, as that would be the power draw not the "radio" head unit.

Is it a 7.5amp fuse?

 

[SenorNoob]

i have a 10' pioneer sub

I wanna see pictures! A 10 FOOT sub has to be awesome! I didn't know Pioneer made anything that big.

 

[4banger_ranger]

its 10", sorry ya'll cant let a ****ing type-o go