What would cause my 20 amp engine fuse to blow? I just got a tune yesterday, would that cause that fuse to blow for some reason? This fuse is the 20 amp engine fuse... I think it is A8 on the 2005 Evo 8, but what exactly does it power and what else should I think about as far as this problem? I have Buschur Racing Mini battery and I have a stereo that requires alot of power, but I have had that setup for awhile without any problems. It was after the tune yesterday that I started having these problems, but I don't want to just blame it on something like a tune unless I know for sure. I want to know exactly what it is so I can correct it. Thanks for any help on this issue.

 

Go to Autozone or Advanced auto and have them load test your charging system. If you get to where you are pulling more than the alternator is capable of putting out then you might be blowing fuses. I have had this problem but not in my Evo. I put a high output alternator in the truck that I was working on and problem solved. This was after I upgraded connectors and wires. Also try taking the stereo out of the equation for a while and see if that fixes the problem. Is the stereo wired into the same circuit that the fuse that blows is on? I may not be the smartest guy but if I can help I will be glad to. Let me know what I can do.

Josh

 

I had this exact same problem a couple weeks back, left me stranded in traffic in the rain.

If you have an aftermarket downpipe, which I assume you do, check to make sure the o2 sensor isn't rubbing. mine rubbed the wire shielding off and grounded out in the rain.

 

I appreciate the ideas, and I will check in to all of those answers.