So I've been having troubles with my truck lately misfiring when cold hesitation all that fun ****. (Check my other thread "coil specs" I believe for the full details) any ways yesterday no check engine light. But codes 12 37 and 55. Today I got the light and it's code 46 Charging system voltage too high. Wtf how do I deal with that? I've been runing this alternator for ever so I don't understand. All I've done this weekend is changed the coil popped the distributor cap off and put back on ( how much play is that rotor suppose to have?) what should I look at for my charging voltage to high?

 

rotor should be almost nothing!! is your battery actually overcharged?? if its not its either that voltage block behind air cleaner on fire wall or somethings wrong with your alternator..... I feel bad for you.. up to 3 threads on this issue and still cant figure it out!

 

Oh man I don't know if it's all related or completely different problems

 

Code 12 is begining of test, code 55 is end of test. some years flash one or the other some years flash both.