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Early Motorola two wire alternator

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waybomb
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Early Motorola two wire alternator

Postby waybomb » July 29th, 2017, 6:59 pm

Anybody have any idea what the ignition wire is for on an alternator found on a 1987 mariner with crusader engines.
Only getting 13 volts output to batteries.
This is a Motorola 50 amp.
It appears to have a mounted external regulator on the back.

I'd like to see if I can fix it.

How do I test the alternators output, unregulated?
Thanks
Fred
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Re: Early Motorola two wire alternator

Postby bud37 » July 29th, 2017, 7:38 pm

If memory serves me I think that can be used to excite the field.........thats what comes to mind , been a while......need 1500 rpm,should see 14.5 volts at that.....at idle you may just see battery voltage.......... :beergood:
FWIW.....The above is just my opinion..... :popcorn:
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Re: Early Motorola two wire alternator

Postby waybomb » July 29th, 2017, 7:54 pm

That's what I thought it was for but not sure.
Only have 13vdc at all rpms.
Barely keeping it charged.
Thanks
Fred
1969 Glaspar Avalon /1967 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
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Re: Early Motorola two wire alternator

Postby mjk1040 » July 30th, 2017, 6:43 pm

Sounds like it needs to be pulled and replaced or rebuilt.
Mike :down:
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Re: Early Motorola two wire alternator

Postby Viper » July 31st, 2017, 7:08 am

Are you sure it's a regulator or is it a brush cover you're looking at?
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Topic author United States of America
waybomb
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Posts: 2545
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Location: Saint Joseph,Mi
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Re: Early Motorola two wire alternator

Postby waybomb » July 31st, 2017, 10:26 am

Yes it's a regulator.
Motorola/prestolite 8mr2022k bi-directional alternator.
New number 8mr2048ka.
Sent a note to db electric for a price on a new one.
Thanks
Fred
1969 Glaspar Avalon /1967 Johnson Electromatic 85
1987 Carver Mariner
1988 Cougar Kevlar 46' with triple blown 572 ci
1995 Boston Whaler Rage
Past - 1988 2807, 1989 4207 Aft
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