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Originally Posted By: HangFire Originally Posted By: michaelluscher You did remember to hook it up to a SWITCHED power source, correct? Originally Posted By: oguruma Its connected to the factory radio wiring.... You may think you've answered his question, but you have not. Factory wiring can...

There is no in-line filter, just a fuse on the constant wire. I am kind of afraid to keep trying things at this point, for fear of killing this lead-acid battery too many times...

I am at a loss as well... There are definitely no melted wires... The battery holds a charge just fine as long as the harness is not plugged in. If that harness is plugged in the battery dies. This is even if the radio isn't plugged into the aftermarket harness....

I taped off the un-used wires...

I used an aftermarket pigtail adapter. The battery dies with just the aftermarket adapter plugged in and nothing on

I might have screwed up my DMM, since it's not fused, but I connected the factory harness and it read as over 10 Amps with the doors shut and everything else off. It went back down to 10 mA when I unplugged the harness. Would this indicate that there is a short in the harness?

I'm not sure how old the battery is. I can't find any sticker that indicates the date of manufacture. It is the OEM battery, so it is possible that it's the original battery from 2006, but I can only speculate.

Its connected to the factory radio wiring....

Hello, I have a 2006 F 250 Superduty (5.4L V8). I removed the factory head unit (AM/FM only) and put in a Pyle Aftermarket CD Player. I used an aftermarket harness soldered to the harness that came with the new Head Unit. All connections seemed like they are soldered well. After I connected...