Engine/Transmission (1998.5 - 2002) errrr... some help please~! Voltage (I think) problem.

[Jeepmullet]

Okay,



After a cool (around 45 degrees) night the other night I went out and started my truck. It was not plugged in because I was at work that night and there was no place to plug it in. It took forever for the WTS light to go off, which I expected. After starting, during the cycling of the manifold heaters the voltage was fluctuating between 8 and 11 volts. Normally when they are cycling, it goes between 12 and 14. 5 volts. After holding it at 12-1300 rpms for several minutes, I started driving. During that time the voltage never got above 11. When I came to a stoplight 40 miles up the road and had to come to a complete stop, the truck shuddered, and the voltage gauge bottomed out at 8. The check gauges light came on (and I freaked out). I thought it was going to die, so I hit the loud pedal.





After that the voltage came up to 14. 5 and stayed above 14 for the remainder of the trip, which was another 120 miles.



What was that about? The voltage stayed low long after the heaters stopped cycling on and off and the temperature was at operating temp. I was running 2200 rpms the entire drive.

 

[DieselTweaker]

Sound's like you might have a problem with the ALT. reguarding the internal regulator. but before you start changing part's check the battery cables and all your connections. Also Check your belt, and belt. If you have a volt meter you can check our battery voltage, and your output voltage from the alt.

 

[Jeepmullet]

Sound's like you might have a problem with the ALT. reguarding the internal regulator. but before you start changing part's check the battery cables and all your connections. Also Check your belt, and belt. If you have a volt meter you can check our battery voltage, and your output voltage from the alt.

Thanks! I hope it's just a faulty connection. I'm having trouble understanding why I only saw it that one time. Oh well, hopefully this weekend I'll get some time to mess around with it.

 

[DieselTweaker]

well I hope it is too that's a simple and easy fix,, but im leaning towards the alt.

 

[Bob4x4]

Sound's like you might have a problem with the ALT. reguarding the internal regulator. but before you start changing part's check the battery cables and all your connections. Also Check your belt, and belt. If you have a volt meter you can check our battery voltage, and your output voltage from the alt.

Guess again... ... ... ... the 2000 does not have an internal regulator. It is controlled by the PCM



Bob

 

[obert]

Clean Connectons first. Ive seen Some really crazy stuff from bad batt conections on computer controlled equipment...

 

[Jeepmullet]

Guess again... ... ... ... the 2000 does not have an internal regulator. It is controlled by the PCM



Bob

any guesses then? Assuming I check and everything is clean as far as the connections.

 

[Bob4x4]

any guesses then? Assuming I check and everything is clean as far as the connections.

I like to test not guess



You should test the batt's,of course you have already checked and or cleaned all connection. right? check the inputs to the alternator and if ok,ck the output of the alternator. At that point you will have about a 99 percent chance of being good to go.



Bob