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Old 10-13-2016, 11:41 AM   #1
iyzmi
Scooby Specialist
 
Member#: 150004
Join Date: May 2007
Location: Milwaukee, WI
Vehicle:
2002 18g WRX
WRB 310hp/285tq

Default Sporadic Power Spiking Issue

I've been having an issue with my 02 WRX that I don't know how to diagnose. My head unit and Prosport oil temp gauge both die for about 1 second and then start right back up immediately, so it seems like the power is spiking. If I remember correctly, they are both on the same +12V circuit. This happens at least once almost every time I drive the car, and I have noticed that the problem normally occurs when I am in gear and let off the throttle completely. The alternator and battery are both brand new as of last year.

Possibly related: Last year I was having issues with starting the car. Long story short, it turned out I had a lot of resistance between the starter and the battery, I'm assuming the wiring was/is rusting and causing the resistance. I ran a new power cable to the starter, resistance dropped down to normal, and haven't had an issue since. My concern is that other wiring may also be rusting and the resistance is causing this issue as well. If that's the case, I don't really see a clear solution.

Any thoughts?
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Old 10-28-2016, 10:47 AM   #2
iyzmi
Scooby Specialist
 
Member#: 150004
Join Date: May 2007
Location: Milwaukee, WI
Vehicle:
2002 18g WRX
WRB 310hp/285tq

Default

This happens when I let get on the brakes. Is there any way the brake light circuit may be shorting the +12V radio circuit?
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