My 98 Mustang V-6 is having a very irritating and confusing electrical problem. It all occurred two days after I got it. When I bought it the RPM gauge wouldn't work but would come on after about a half hour of running but it'd flinch alot. That was the only problem. Bought it without a stereo in it, so I threw one in and tested it multiple times before I finished putting it in. Once I got everything in, I tested the stereo and it also wasn't working. So I started playing around with everything and the lock and unlock button wouldn't work and when pressed the parking lights would come on including the taillights. I noticed a clicking when it was first pressed coming from the trunk also. The power mirrors also wouldn't work either. The chime would only work when you turned the car on but not when you opened the doors. The interior lights also didn't work. So I decided to take her for a drive to see if there were any other problems. The speedometer wasn't working..... I ran a wire to the battery to power the stereo until I can get it fixed. I checked the fuses also, it blew the #8 I believe So I thew in another one and it DID NOT solve the problem. I used a test light to see if all the fuses are getting power a couple weeks ago. They all have power.
About a month later every problem disappeared and everything began to work again on its own. It all worked for a week until today. Every problem came back again.
So I got to looking around on the internet to see what it could be. I read about the Security Module, RKE Module, fusible link in dash or it being a short somewhere.
I need some input though and some ways to go about fixing/finding the problem cause I'm clueless and broke (aren't we all?
Things not working
- Interior lights
- Power locks ( park lights turn on when pressed) clicking in trunk also
- Power mirrors
- RPM gauge
Thanks for your help.