New stereo head unit blowing cig lighter fuse

[CountFloyd]

Hi folks,
Just installed a new head unit in my jdm 80.
Works get but blows the cig lighter fuse.
Also the blower fan motor hasn’t worked since I installed it.
Just pulled it back out and noticed it says +12V to ground on the head unit.
Can’t imagine this is not relevant.
Anyway, has anyone else been down this path?
Was there a solution???
Thanks.

 

[ajax1]

What harness did you use? Pull factory amp?

 

[CountFloyd]

What harness did you use? Pull factory amp?

Don’t think I have a factory amp. Used a tetra harness.
Wondering if I need to completely insulate it electrically and run a separate ground to the battery. That’s a real pita.

 

[mudgudgeon]

run a separate ground to the battery. That’s a real pita.

Should be no need to do this unless you were running aftermarket amps that draw a lot of current.
Just make sure to ground it to part of the metal dash frame with a clean, solid connection

 

[bobbys]

I had this problem when I installed a new stereo. Some of the wiring harnesses have a loop that I believe is for the antenna motor. I don't have a motorized antenna anymore. I cut this wire and everything worked as it should. No more blown fuses.