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> Bosch Alternator questions
TRP
post Mar 13 2026, 04:20 PM
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Hello Gang!

While the motor is out being rebuilt I figured I would look at the starter and alternator and replace what might need replacing. The starter has a cracked cap on the solenoid, so I've ordered a new starter, will be here Monday. I'll ship the core back and recoup some of that money.

The alternator (Al75x) makes a funny noise when I spin it. It appears to be older possibly the original to the motor (82k miles), so I think I'm going to replace it while it's out. I ordered one from Pelican, they called to let me know that the one they had is sold and they didn't know when they would get more. Sierra Madre is out as well. Is this something I can just get from my FLAPS? I understand that it's doubtful that they will have on on the shelf, but is there any issue with going Oriley or Autozone? A Bosch Al75x should be universal, no?

Any benefit/risk with going with the 70amp unit?

Where is the voltage regulator on a 1975? is that hiding over on the relay board?

Thanks!
Ted
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930cabman
post Apr 2 2026, 08:43 AM
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I have found locating an old school rebuilder of alternators/starters is the best value, and it keeps the small guy in work.

btw: what is the maximum output voltage for these? AFAIK overcharging is a real issue (aka hellhole)
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Posts in this topic
TRP   Bosch Alternator questions   Mar 13 2026, 04:20 PM
Ishley   I bought a 75 amp off ebay... ~$350. Works g...   Mar 13 2026, 05:37 PM
fiacra   Hello Gang! While the motor is out being re...   Mar 13 2026, 05:41 PM
TRP   I will give the shop out in Berkeley a call and sh...   Mar 13 2026, 06:31 PM
bdstone914   @[url=http://www.914world.com/bbs2/index.php?showu...   Mar 14 2026, 07:04 AM
porschetub   Hello Gang! While the motor is out being re...   Mar 13 2026, 06:42 PM
brant   I have a couple rebuilds from the Berkeley shop if...   Mar 13 2026, 06:43 PM
JeffBowlsby   Uh oh… Google says Alternators Unlimited in Ber...   Mar 13 2026, 08:25 PM
TRP   Uh oh… Google says Alternators Unlimited in Be...   Mar 13 2026, 08:49 PM
MartyYeoman   If you're looking for a reputable rebuilder, m...   Mar 13 2026, 08:53 PM
TRP   Thank you all for your offer in the cores/rebuilt ...   Mar 14 2026, 08:53 PM
SKL1   Just had the alternator from my '71 rebuilt at...   Mar 14 2026, 09:08 PM
TRP   Just had the alternator from my '71 rebuilt a...   Mar 15 2026, 08:36 AM
TRP   @porschetub - my apologies, I should have been mo...   Mar 15 2026, 11:04 AM
SKL1   Ted, PM sent. Also got an alternator refresh kit ...   Mar 15 2026, 10:08 PM
TRP   I was able to get one of the original Bosch altern...   Apr 1 2026, 09:43 PM
StarBear   Yay! :Qarl: I love happy endings. :beer3:   Apr 2 2026, 07:08 AM
930cabman   I have found locating an old school rebuilder of a...   Apr 2 2026, 08:43 AM
DeanBob   Hello Gang! While the motor is out being re...   Aug 7 2026, 10:52 PM


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