Site Search
Print Page Setup Profile Login
Section Image

Pajero Alternator overcharge

Submitted: Sunday, Dec 04, 2005 at 11:07

Boy boy Nova

The original alternator on my '92 diesel Pajero died recently (245000km and not charging) and was replaced with a new unit.
The new unit started to overcharge about two weeks later and was replaced under warranty. The next one did the same and was replaced under warranty. Now its happened again!
Two auto electricians assure me that the vehicles wiring is not to blame.
I'm getting tired of replacing batteries and mopping up battery acid from my engine bay.
Any ideas?
Advertisement
ThreadID: 28602 Replies: 2
Views: 1111 FollowUps: 2
This Thread has been Archived
Thread Summary
Thread Watch Back To Forum Alert Moderator FAQ
AnswerID: 142335   Submitted: Sunday, Dec 04, 2005 at 12:04

Member - Geoff M (Newcastle) replied:

Is the voltage regulator internal to the alternator? If so, try a different brand of replacement alternator. (Assuming all the replacements have been of the same make and model)

Geoff.

Click Image to Enlarge
Geoff,
Landcruiser HDJ78,
Grey hair is hereditary, you get it from children. Baldness is caused by watching the Wallabies.
Reply 1 of 2
FollowupID: 395893   Submitted: Sunday, Dec 04, 2005 at 12:23

Boy boy Nova posted:

Thanks Geoff.
The regulator is internal. Apparently other brands are still rebadged mitsubishi alternators. Still, it could be worth a try.
FollowUp 1 of 1
AnswerID: 142418   Submitted: Sunday, Dec 04, 2005 at 23:29

techie replied:

If the regulator is internal to the alternator, there should be 2 wires from reg.
one is the indicator which determines if alternator is working. It goes to charge lite and then throuh ignition to battery.
The second wire is voltage sense wire - it should be connected directly to battery, either through ignition or direct.
This wire determines the voltage at the battery and adjusts the output from the alternator to overcome resistance in charge lead.
Make sure this wire is at 12 volts - if it is disconnected, the alternator thinks there is no voltage at battery and produces max o/p voltage from alternator, thus overcharging battery
Techie.
Reply 2 of 2
FollowupID: 396001   Submitted: Monday, Dec 05, 2005 at 15:50

Boy boy Nova posted:

Thanks for your the response techie, I'll chase that up with the auto electrician.Cheers
FollowUp 1 of 1