1987 cucv alternator problems???? blowing regulators????

[cwilliams]

ok im stumped .... before having the alternators rebuilt the gen2 light started to stay on. so I had it rebuilt and when I put it all back together ...bam after I started the truck the voltage went from normal to around 35v if I remember so I took both alts off took them to the shop and alt 1 was peging the volt meter ...the regulator had blown. ok replaced it ....put back together and once again over charging... alt 1 reg blew again ... I double checked the wires and how they go on the back of the alts and all looks good .... I don't know what could be the problem .... please help this is one of our most called out trucks on our fire dept ....

 

[cucvrus]

Is the ground from the drivers side left alternator hooked up to the alternator and to the intake engine bolt? I am not sure how to help you with out seeing it. But I think you are going to need a voltmeter and read some of the other threads that have been posted in the past. Good Luck. Electrical is not one of my stronger points with out being there.

 

[joshuak]

Sorry this is happening. I have not dealt with this issue myself, but I can share some good posts for you to read, if nothing more to kill time, while more experienced members help you out.

http://www.steelsoldiers.com/showthread.php?56247-Alternator-trouble#post651739

http://www.steelsoldiers.com/showthread.php?54292-CUCV-alternator-symptoms-diagnosis-and-fix

 

[Warthog]

Post some pictures of the wiring on both alternators. I should be able to tell if they are wired correctly.

Also who rebuilt the alternators? Did they reinstall all the fiber washers correctly?

 

[cwilliams]

yes all is hooked up as seen on a few other trucks .. but thanks

 

[cwilliams]

and warthog I will do so asap.... I haven't a day day off in weeks..... the guy that built them works at b and c electric here in Terre Haute,IN and im not sure if the washers are right...

 

[cwilliams]

would It be easier to just make it 12 volt ... after looking at a few things it sounds like a possible good idea ... 1 battery for the emergency lights and 1 battery for the starter. .... any thoughts

 

[Hasdrubal]

I personally don't think a 12V conversion is a good idea. I like to have 24V to spin the starter. The 6.2 has 21.5 compression ratio. When it gets really cold in the winter, the batteries are noticeably affected. Likely I wouldn't get the motor to fire on only 12V. The starter must spin 200 rpm for the engine to light up.