18-23 when it was brand new. A week later towed to dealer with the wrench light on. A week after that it gets returned to me with a new knock sensor and averaging 14 -20. And it's just gotten worse since then. Average 13 -16 now. Hotrod mustang and corvette both get better mileage than the...
Part of the upgrade was recent. Went from alpine mini amp in dash to jl audio big amp under passenger seat. The bigger amp is what brought it all to a head. Sub was there causing problems that weren't being noticed.
@airline tech , okay finally got a chance to run the tests. Been very busy as I found my father in law passed away yesterday. That was not fun. Anyway 35 and 37 are both switched 13v ignition on 0v off evidently the alpine sub amp was backfeeding from day one installed in the truck less than 2...
I'll try that again as I still need to install some switches for lights. They been mounted for a year and never wired. But one question I have to ask is what year truck did you test? I Jane read of others using the same fuse on a 21my and never reported a problem.
Wanted to add to this thread. I talked to a buddy of mine that owns a shop yesterday. His son was telling me that he had an almost identical problem on a newer challenger. He said he was able to fix it by installing a diode in the amp excite wire. Said the amp was backfeeding the fusebox. So if...
Okay still waiting on meter. So I decided to do some other testing. Pulled the remote start and updated it. The entire time it was out and I was programming it in the floorboard with my laptop the sub kept thumping every minute or so. So i pulled the add a fuse and wired the excite to the acm...
Also I turned off ford pass 2 years ago. They had new terms that I couldn't agree to so it locked me out and I deleted it. Even the dealer told me the last time it was in, that they couldn't retrieve the code through Ford pass as my truck is not connected. And the code was no longer there...