So excited about getting my first Mustang. Until it started crapping out. Battery goes dead over night. Heard rumor it could be the Shaker 500. Radio stopped working off and on, seems to reset once you unplug battery. But now the temperature control stopped working too. This seems to be a common problem. Any suggestions?

 

In regards to the 'reset' and the temperature control concerns, there's the possibility the SJB is messed up. It's the box on the passenger side of the car where the fuses are behind the kick panel. There's also wiring thereto, and connectors, as well as the devices themselves. It can be... um... fun... to figure out what's wrong.

To track down the drain and figure out what's doing it, here:
https://themustangsource.com/forums/...-drain-544459/
You'll need to then trace the wiring thereto to find out why it's doing it. Ensure the wiring and any connections between the fuse and the component aren't a problem.

And then a general 'do this because these cars are horrible about batteries/alternators' subject by yours truly:
https://themustangsource.com/forums/...4/#post6917899

Of course, it could be a dead battery that's just barely on its last legs, so a trip to Walmart for a battery is perhaps in order. They're all the same Johnson Controls/whatever they changed their name to recently, just labeling, so may as well buy the cheapest one. It's also got a 2 year warranty no questions asked, so not bad.

These are pretty much going to be what you're gonna need to do to track it down and fix. Whether it's a dirty battery, shorted wiring, or a runaway active component, these should get you down the right path to fixing it. Yes it's tedious work. Sometimes it's like that. Worth it in the end, as you'll know how to do it, what it was, and that it's fixed and you can enjoy your car!

Hope that helps, and welcome to the forums!

 

you can test it by pulling the radio fuse(s) and then see if the battery still goes dead overnight . . . I am not sure of the exact fuse number(s) but you can find it in the owner's manual, and I think there might be more than one . . . if the radio goes completely dead, including the clock, then you got it

if battery still goes dead overnight, then it is probably the battery -- if you don't mind spending about $100 for "troubleshooting" it's a quick trip to Walmart for a new battery, like houtex said