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Isuzu alternator overcharging.


orangemach5

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Hi all,

Engine is all in and running well finally!!! I put a new alternator on, having wired it all up it charges fine but at higher revs it overcharges (16-18V!!). I would of thought it would be a reg problem but the alternator is brand spanky. Its the 80amp version with the 3 pin plug on the rear. Any ideas before i go on a rave to the supplier :lol: !!

Many thanks

Paul

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If that 16-18 is measured across an otherwise good condition battery then yes you have a duff one.

Steve

Hi Steve,

thanks for the reply. It registers 17.5 volts on both Optimas :( ! I spoke to the supplier and he said they cant high speed test them because of the oil fed vac pump on the rear, he is kindly sending me out another :rolleyes: . So Ill fit that and see what we get. The last thing i need is 2 fried Optimas!

Cheers

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