70 amp alternator

WhirledTraveller · Posted: Sat Mar 24, 2012 8:31 am Post subject:

I bought an alternator from that ebay guy which was a stock 55amp supposedly rewired to 75 amp, much cheaper than the proper 70 amp alternator and drops right in no need to muck with pulleys and backplates.

I can't say for sure whether it's putting out 75 amps, but the voltage is rock steady at all RPM's which is more than I can say for the Bosch unit it replaced which lasted all of one year.

Even with a fridge and propex heater, your amp demand may be less than you think. Fridge = 5 amps maybe, propex = 2 amps. Charging two batteries is no big deal for the stock alternator, the real problem is steady draws like the 20amps of the BA-6 heater or big audio systems. You will find that with constant voltage charging in an automotive system, the amperage the batteries draw during charging levels off at a pretty modest level for most of the charge. Putting in a bigger alternator doesn't change a whole lot especially if you're using a standard charge relay which is inherently limiting.

There's a simple way to test this without an ammeter, just a voltmeter. Take your bus with fully charged batteries and run it, rev the engine just a bit, and take note of the system voltage at the battery. It should be around 14 volts.

Now run your house battery half way down and repeat the same test with all your accessories on. If it's still at 14 volts then the alternator is big enough and any bigger is just a waste of time.
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1977 Westy, Automatic. Big Valve heads, CS Cam.

gatorjos · Posted: Tue May 21, 2013 7:41 am Post subject:

1975 Kombi · Posted: Tue May 21, 2013 8:09 am Post subject:

TomWesty · Posted: Tue May 21, 2013 8:13 am Post subject:

gatorjos · Posted: Tue May 21, 2013 8:27 am Post subject:

gatorjos · Posted: Tue May 21, 2013 11:06 am Post subject:

I talked to Bob -- very nice guy and ordered a 75A for $99. They take the stock alternator and put in a Mercedes stator making it 20A more juicy. They also sell the AL108X for $175, but I'm cheap Laughing

Number is 818 442 9082 BNR parts in Van Nuys
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1977 Westfalia Weekender Berlin "The Kitebus" aka " Colonel Mustard"

Previous romances:
1972 Ghia cabriolet (full body-off restoration -- stolen after five years of ownership)
2004 Passat 1.8T (manual)

http://21stcenturyhobo.com

jstrother123 · Posted: Sat Nov 30, 2013 8:31 pm Post subject:

Sorry to join in this discussion so late, but do you have contact info for the Van Nuys guys you talked to? Thanks.

Jim

gatorjos · Posted: Sat Nov 30, 2013 9:54 pm Post subject:

Jim,

I put the name and number in the post above.

Cheers,
Jos
_________________
1977 Westfalia Weekender Berlin "The Kitebus" aka " Colonel Mustard"

Previous romances:
1972 Ghia cabriolet (full body-off restoration -- stolen after five years of ownership)
2004 Passat 1.8T (manual)

http://21stcenturyhobo.com

Vince Waldon · Posted: Sat Nov 30, 2013 10:04 pm Post subject:

jstrother123 · Posted: Sat Nov 30, 2013 10:10 pm Post subject:

Thanks, for some stupid reason I read that as a part number. I need to read things more carefully in the future.

Jim

1967250s · Samba Member Joined: May 02, 2007 Posts: 2137

Don't see how the stock regulator would work for very long. All the charging wires would need to go up one or two sizes. Are you sure it's ok? I'd sure be interested in putting a good electric heater somewhere.

DougB · Posted: Wed Jun 29, 2016 10:29 am Post subject: Re: 70 amp alternator

Hello all,

Just wanted to check in to see how those with the higher output alternators from the eBay guy in Van Nuys are fairing...any issues with them so far? Seems like a great option but, like another past poster said, it seems a bit too good to be true.

Thanks,
- Doug
_________________
'75 Campmobile (tin-top to SpaceRoof)
'73 Fastback
'52 BMW R67/2
'41 Zundapp KS600
'55 Puch SGS250
A very, very understanding wife

BayCreamPuff · Posted: Wed Jun 29, 2016 10:42 am Post subject: Re: 70 amp alternator

WhirledTraveller · Posted: Tue Jul 05, 2016 6:02 am Post subject: Re: 70 amp alternator

DougB · Posted: Tue Jul 05, 2016 8:48 am Post subject: Re: 70 amp alternator

Good to hear...just got my eBay bucks certificate for this quarter so I might apply it to a purchase of one of these things.

Thanks!
_________________
'75 Campmobile (tin-top to SpaceRoof)
'73 Fastback
'52 BMW R67/2
'41 Zundapp KS600
'55 Puch SGS250
A very, very understanding wife

69BahamaYellow · Posted: Tue Jul 12, 2016 5:10 am Post subject: Re: 70 amp alternator

gleason · Posted: Wed Nov 02, 2016 8:01 pm Post subject: Re: 70 amp alternator

Ok, opening an older post here. I'm looking at putting and electric compressor in for my AC in my 74 9 pass. Came with a 1700, PO replaced with a 1600 and generator/regulator. Building a 2.0 for it so I would like to have a 75 amp alternator. "I talked to Bob -- very nice guy and ordered a 75A for $99. They take the stock alternator and put in a Mercedes stator making it 20A more juicy. They also sell the AL108X for $175, but I'm cheap Laughing

Number is 818 442 9082 BNR parts in Van Nuys" From a previous post. Seems like they are on ebay now for like $275, quite a bit more than the $99 of the previous post. Any info on this? I'd sooner have a stock style with more amps and avoid all the problems and different parts noted above in getting what I want, but a little pricey? Or am I just cheap?? http://www.ebay.com/itm/VW-Mini-Bus-Porsche-914-Alternator-75-Amp-High-Amp-Generator-/282047978942

twinfin · Posted: Sat Nov 12, 2016 4:54 pm Post subject: Re: 70 amp alternator

Same here. Wondering why the big price hike from $99 to $275. In only a few years

I see two companies on ebay offering the higher output alternators that were mentioned here. They are "bnrparts" for $275 plus $20 Shipping and "eagleautoelectric" for $250 plus $20 Shipping.

There listed as a AL75x that have been upped from stock 55amps to a higher output of 75Amps.

I wonder if the alternators wiring harness needs to be upgraded?

...also they look to offer at times the AL108X 70amp model upped to 120Amps

I need to order one asap. My alternators bearing just froze and smoked the belt!
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"It's knowledge to learn from your mistakes. But it's wisdom to learn from others!"
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“He that goeth to bedde wyth Dogges, aryseth with fleas.”

"The Blue Submarine"
1977 Campmobile, Type 4 2.0 liter Federal, Non-Catalyst, Fuel Injected with Valvetrain from the type4store, 411 Heat Exchanger Preheaters, S&S Header, Supertrapp Silencer. ...and a lot of help from Clatter and TCash and friends!

gleason · Posted: Sat Nov 12, 2016 5:07 pm Post subject: Re: 70 amp alternator

Well they told me the cores have went up so much. I guess the Mercedes or what ever they use are in short suppley. He told me $200 if I send him a core 55amp. What I like is that nothing else has to be changed. No fan or housing or anything. Supposed plug and play and charge like crazy! No a camper or a big stereo useage or anything, but I want to make sure I have enough as I may put electric compressor for my AC in the future.

gleason · Posted: Mon Nov 14, 2016 9:19 am Post subject: Re: 70 amp alternator

Anybody know what size stator is in the 55 amp? I talked to a local rebuilder and he said if we can find the dimensions of that, he can look up to see what else might be available. If my alternator is ok EXCEPT swapping a new stator, he tells me that we would be @ about $60-75!!! I may have to send him one of mine just to see what we can do..


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