I posted recently about the possibility of using a 240 alternator on a 940. It was pointed out that it was probably only a 55 amp unit and not up to the demands of the 940’s electrical system.
Included in that exchange was a post by John Sargent that included a link to turbobricks.
(http://forums.turbobricks.com/showthread.php?t=349853)
15A gave instructions and nice images on making repairs/component replacement on the Denso alternators. That caught my attention because I had two “dead” Denso alternators that could possibly respond to some attention.
It was obvious that replacing the brushes, regulator and the bridge rectifier was a relatively simple task. I was lucky that the slip rings on both alternators were in great shape (although they are available as well).
I found two videos that were helpful. While neither were specific to the Denso alternators in the Volvos the information they provided was what I needed to diagnose the faults in mine. I found the bridge rectifiers were defective in both of my alternators. Unfortunately I did not have access to the equipment needed to test the regulators.
https://youtu.be/IMCxEd0pahs
https://youtu.be/at_R7sENE0s
15A listed Maniac Electric Motors as one of the suppliers he used. They had a number of parts for the Denso alternators on the 7/9 series Volvos.
https://www.maniacelectricmotors.com/alternator-for-volvo-740-940-100211-8630-8631-8632.html
Since I couldn’t test the regulators I decided to buy a new regulator as well as a bridge rectifier. I had a new brush set and the bearings were still rolling quietly. Maniac Electric provided free shipping and fast service.
I installed the parts and had the alternator tested. It passed all tests and showed an output of 14.2v I am happy to have a spare in case I need it. I think I will order another bridge rectifier and put the second unit together with an old regulator gambling on at least one of the two old ones being good.
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Any twenty minute job is just a broken bolt away from a three day ordeal
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