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Alternator!!!!


 
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moonoroof
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Joined: 04 Feb 2007
Posts: 219
Location: IRELAND

PostPosted: Wed Sep 22, 2021 19:03    Post subject: Alternator!!!! Reply with quote

My Trooper 3.0 wasnít charging as it should. Meter fluctuating, sometimes it would sit at 6v, then move to 10, then a maximum of 13V.
Fitted a brand new blue relay and that didnít  help. I bit the bullet and had a new 90amp alternator fitted. Itís improved the charging, but the maximum input at idle is 13.9V. Two of my friends have 3.0 Troopers, so I checked both of them today and each are reading 14.5 V at idle.
I wonder whatís wrong!
Any help in finding the solution would be appreciated.
Thanks
Michael
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PostPosted: Wed Sep 22, 2021 19:03    Post subject: Google Ads keep this community free to join!


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Versatile
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Joined: 19 Aug 2015
Posts: 36
Location: Worcestershire

PostPosted: Tue Sep 28, 2021 17:04    Post subject: Reply with quote

Is the 'new' alternator from Isuzu or is it a pattern ?
I think it makes a difference. I'm sure I've read here that it won't work as intended if it's not a genuine part from Isuzu.

Probably something to do wit the reg/rec in the alternator.

If it is genuine then are the belts at the correct tension ? It doesn't take much slip to slow down the charging.
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moonoroof
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Joined: 04 Feb 2007
Posts: 219
Location: IRELAND

PostPosted: Wed Sep 29, 2021 12:50    Post subject: Reply with quote

Versatile wrote:
Is the 'new' alternator from Isuzu or is it a pattern ?
I think it makes a difference. I'm sure I've read here that it won't work as intended if it's not a genuine part from Isuzu.

Probably something to do wit the reg/rec in the alternator.

If it is genuine then are the belts at the correct tension ? It doesn't take much slip to slow down the charging.


Thanks
It's a 90 amp pattern one.
Got my mechanic to check it. It's putting out 14.5 V alright, but the voltage is a bit less on the gauge and at the batteries: 13.8V. The belts are tight too.
He's going to do a few more checks next week to see what's happening
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