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Ok, gonna tell what I did yesterday. I decided to take the new alternator off and have it tested at Oreillys where I bought it, because I wasn't having this problem until I changed it because they had told me my old one was bad and wasn't, it was the starter. I also decided to go ahead and just...

I removed the coil and cleaned and sanded the bracket it bolts to and the grounds below it. Used multimeter and got a reading of 1.2 primary and 10.35 on secondary ( which I found online should be .8-1.5 primary and 9.5- 17.5 secondary ) . Cleaned alternator connections, ground by battery, took...

Thank you . I will try all this and let you know back

No codes and engine runs smooth. Question, If the actual O2 sensor is bad can it blow that fuse. Everything I read and mechanics tell me is a bad O2 would throw up a code if bad and would be running rough. I will do that with the coil. This must be a pretty rare problem . With this doing this...

They gave me a Ultima 117 amp Part #: R111073A . Would that diode in PCM cause the F21 fuse to blow at random times ? I put multi meter on battery , red to hot, black to ground and battery at 12.5. Crank and idling 13.8-13.9, Rev engine up to 2000 or 2500 rpm and most it goes is 14.2-14.3...

Thanks for the reply. No just the engine was swapped. They said they checked all the wires while in shop and it's possible they just moved something and it temporarily worked. I assume when I put the 30 amp fuse in there to try to get home it caused the 25 amp fuse to the ASD to blow. Is it...

I have a 99 jeep cherokee sport 4.0. In approx. 2011 I had to install a used engine from a 98 Jeep Cherokee ( don't think that matters, but want everything known on it) . Back a little before 10-15-21 , a couple times I would go to crank engine and it would try to turn over but wouldn't, try...