Newer one has an internal regulator. Are mounting bolt holes same size?
Alternator upgrade
- Thread starter autowerks
- Start date
Chris,
Sorry about the delayed response. Unfortunately this work gets done in the margins. No the bolt holes are not the same. The newer alternator definitely has larger bolt holes.
I am figuring I will need to get the old one rebuilt and I have a shop that is willing to try. Are they going to have issues finding parts too?
Best, Greg
Sorry about the delayed response. Unfortunately this work gets done in the margins. No the bolt holes are not the same. The newer alternator definitely has larger bolt holes.
I am figuring I will need to get the old one rebuilt and I have a shop that is willing to try. Are they going to have issues finding parts too?
Best, Greg
Newer one is e12 with m10 bolt. I had mine rebuilt, don’t know what they did actually though.
I hope this helps others:
The Bosch AL655N was a great replacement for the OEM alternator on my '72 3.0cs in regards to fitment and alignment. One of the threaded bolt holes had to be drilled out to accept the slightly bigger factory mounting bolt and took less than a minute. The pulley had to be swapped over. We now have 14 volts at idle with AC Condensor Fan, Lights and Wipers on as opposed to 12 volts and the lights going dim. All with the comfort of a new "made in USA" Bosch alternator. We also used this plug for a cleaner install in regards to the D+ battery light wire.
The Bosch AL655N was a great replacement for the OEM alternator on my '72 3.0cs in regards to fitment and alignment. One of the threaded bolt holes had to be drilled out to accept the slightly bigger factory mounting bolt and took less than a minute. The pulley had to be swapped over. We now have 14 volts at idle with AC Condensor Fan, Lights and Wipers on as opposed to 12 volts and the lights going dim. All with the comfort of a new "made in USA" Bosch alternator. We also used this plug for a cleaner install in regards to the D+ battery light wire.
Mike Goble
Well-Known Member
It's basically the same as the AC Delco CS-130.
if you have to change things, i highly recommend the change to the newer style adjusting rod from the e30.
i used the 80a AL-46x with the e12 fan (12311350199) and the e12 pulley (12311362465), the bracket 12311274747, with the toothed nut 12317677914
i used the 80a AL-46x with the e12 fan (12311350199) and the e12 pulley (12311362465), the bracket 12311274747, with the toothed nut 12317677914
Honolulu
Well-Known Member
I have what I suspect is an internally regulated alternator that I may have cockroached from a '81 528i that I parted out long ago, mainly for the 5speed trans. It is visually identical to the newer version in post #20. It has a reman sticker on it, over the (unreadable) original Bosch sticker. How can I determine its original identity and amp rating?
Can someone confirm that an internally regulated alternator needs the only a wiring connections are red to D+ via the ignition switch (and battery positive) , a ground from the alternator body to engine block, and wire from alternator D+ to the voltage regulator?
Can someone confirm that an internally regulated alternator needs the only a wiring connections are red to D+ via the ignition switch (and battery positive) , a ground from the alternator body to engine block, and wire from alternator D+ to the voltage regulator?
That is correct. D comes from battery.