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Alternator swap 900 1992

Alternator on my 1992 940T appears to be dead. It's model 0 123 500 005, 14V, 55-100A. I happen to have a spare alternator from 1986 740T, model 0 120 469 668, 14V 31-70A. Looks the same size and fit. Will it work?





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Changing the Denso bushes 900 1992

Changing the brushes in a Denso is easy enough. Chances are that may all you need.

https://www.brickboard.com/RWD/volvo/1470276/denso_alternator_brush_set_replacement_pictorial.html





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Alternator swap 900 1992

The 1992 normally aspirated cars are equipped with an 80amp alternator.

I don't have a 1992 turbo but I do have two 1994 940T. The turbo cars are originally equipped with 100amp alternators. I have run 80amp alternators on one of those cars because it was what I had on the parts shelf. There were no issues with this swap- short or long term. As an aside I will mention that all of our cars have at least the low beam headlights on anytime the car is running.

I would be interested in hearing why a turbo car would require a 100 amp alternator- as in what additional demand do they present?

Randy





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Alternator swap 900 1992

Dear rstarkie,

Hope you're well. I doubt a turbo adds to the electrical load.

To put a 70-Amp unit in place of a 100-Amp unit might be a stretch, if there's an upgraded sound system, added lights (e.g., fog lights, front and/or back), or auxiliary devices (e.g., chargers of various sorts).

Volvo may have supplied 100-Amp units out of an abundance of caution. The Nippon-Denso units seem to work reliably for at least 200K miles.

Hope this helps.

Yours faithfully,

Spook





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Alternator swap 900 1992


hi boris,
i agree with spook (jay).

with a bit of investigation into the alternator, ie take it apart, look at the brushes, etc, you might discover the failure cause.

for example, i had a denso alt fail on me, but with the help of youtube in diagnosing alternators, i discovered it had a mfg flaw in the stator. ordered the stator with a spare brush set, and fixed it.

used a vom meter.

i buy spare used parts from the junkyard as backups and keep them on the shelf, if you're planning on keeping your volvo on the road for years.

regards,
byron golden
86 245
92 245
94 940





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Alternator swap 900 1992

Dear Boris,

Hope you're well. I'd not replace a 100Amp unit with a 70Amp unit, except perhaps as a "quick fix" to get a car back on the road, until a 100Amp unit take its place.

A 70Amp unit lacks the capacity to supply a 940's greater demands, which is why a 100Amp unit was factory-standard.

Hope this helps.

Yours faithfully,

Spook





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