Pajero Alternator overcharge

Submitted: Sunday, Dec 04, 2005 at 12:07

ThreadID: 28602 Views:8066 Replies:2 FollowUps:2

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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?

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Reply By: Member - Geoff M (Newcastle) - Sunday, Dec 04, 2005 at 13:04

Sunday, Dec 04, 2005 at 13:04

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.

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AnswerID: 142335

Follow Up By: Boy boy Nova - Sunday, Dec 04, 2005 at 13:23

Sunday, Dec 04, 2005 at 13:23

Thanks Geoff.
The regulator is internal. Apparently other brands are still rebadged mitsubishi alternators. Still, it could be worth a try.

FollowupID: 395893

Reply By: techie - Monday, Dec 05, 2005 at 00:29

Monday, Dec 05, 2005 at 00:29

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.

AnswerID: 142418