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  #1   IP: 71.181.37.53
Old 08-01-2010, 10:16 AM
ArtJ ArtJ is online now
 
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how to connect MOtorola 30 amp alternator?

I have a rebuilt and stored 30 amp motorola alternator that has not been on the boat for a number of years.

I would like to bring in as a spare with me on a boat trip to Maine this week
in case I have trouble with the fancy stuff that I installed and need a backup.

I would appreciate it if someone could direct me to the proper way to connect
it. There is a push on terminal with short pigtail and two lug based connections at least.


Thanks very much

Art
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  #2   IP: 142.68.246.75
Old 08-01-2010, 10:20 AM
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Art, some of us have posted pictures and discussions of the Motorola wiring in archived posts. You might want to try a Search using rigspelt for example. Sorry - rushing off for a sail or I'd look them up.
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  #3   IP: 71.181.37.53
Old 08-01-2010, 10:39 AM
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I just browsed some threads.

Apparently, the yellow wire goes to the plus side of the coil,
The output terminal is obvious, and the ground connection I assume
is thru the case bolting.

The regulator terminal is occupied by the regulator already.
There is a ground terminal, but again, I am assuming that it receives this via
the bolt?

Art
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Old 08-01-2010, 08:16 PM
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Make sure that the "fancy stuff" does not include an external regulator unless you can and will bypass it in the event of using your spare which I believe does have internal regulation.
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  #5   IP: 71.181.37.53
Old 08-02-2010, 07:22 AM
ArtJ ArtJ is online now
 
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Hanley

Will do . By the way, in another posting you mentioned not recommending
external 3 stage smart regulators anymore. I would be interested in hearing
your thoughts on this.

Thanks

Art
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  #6   IP: 206.125.176.3
Old 08-02-2010, 09:13 AM
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motorola regulator

Art, If your stock Motorola regulator gives up the ghost, I found a bolt-on replacement that allows you to adjust the output voltage.

One of the problems with the stock regulator on the 35A Motorola is its output is only about 13.8 volts...way too low by today's standards for 12v systems. Compounding that problem on my boat is a passive diode type isolator, which ate another 0.7 volts. My batteries where only getting about 13.1 - 13.2volts. I have the regulator set to send about 14.9 to the isolator, giving me ~14.2v or so at the battery posts.

Hanley, I am interested too. I bought this $45 regulator instead of an external unit from Blue Sea,etc.. to keep my installation simple for now. If I were to get a fancier, i.e., higher output alternator if/when I need one, I'd look to get fancier charging equipment too.

Here is a link to the unit. http://www.ase-supply.com/product_p/trs-m5-197a.htm
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Last edited by sastanley; 08-02-2010 at 09:41 AM. Reason: spelling
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  #7   IP: 206.125.176.3
Old 08-03-2010, 11:53 AM
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Question did we ever answer Art's question?

Art,
Sorry we've gotten so off topic..did you get an answer to your initial inquiry?

I was snapping some pics yesterday and remembered I had a pic from 2009 of my Motorola alternator before I put on the aftermarket regulator.

the pigtail (yellow) is the exciter and heads off to the (+) on the coil.

the large black is alt. output to the charging circuit. Mine heads off to an isolator, but a common wiring set up is back to the starter as well.
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"Holiday" - '89 Alura 35 #109
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http://www.moyermarine.com/forums/signaturepics/sigpic3231_6.gif
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  #8   IP: 71.181.37.53
Old 08-03-2010, 12:16 PM
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Thanks Shawn for the information.

I managed to locate in previously, but your picture is great.

Thanks

Art
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  #9   IP: 71.118.13.238
Old 08-03-2010, 06:17 PM
Dave Neptune Dave Neptune is offline
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Thumbs up Alterantor

Niel, thanx for the pdf!

Where do you keep your boat? Do you ever get to Catalina?

Thanx Dave Neptune
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  #10   IP: 24.152.131.220
Old 08-03-2010, 10:09 PM
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Dave,
I love it over at Catalina, particularly Isthmus Cove but alas, demands of work and family make those weekends all too rare. Hope to get over there later this month and I'll give you a holler before I do, would love to connect w/ you over there.

My slip is in Cabrillo, a little toward the outer harbor from 22nd Street Landing and in front of the Doubletree Hotel. That's 19.3 NM from the Isthmus!

For all youse non-West Coasties, I'm sure Dave will agree there's nothing like BBQ'n steaks in the cockpit as the sun sets behind the island after a 4 hour passage.

edit: OK, moved this business over to the Local Knowledge topic
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Last edited by ndutton; 08-04-2010 at 11:15 AM.
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  #11   IP: 64.203.32.52
Old 08-04-2010, 09:50 AM
Dave Neptune Dave Neptune is offline
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Smile West End

Niel, I was actually the second boat in the new Cabrillo Marina when it opened and was there just over two months rent free, but that's another story.
I have a mooring in Emerald Bay and am a member of the Corsair YC, actually this year I'm the Commodore. I have four more trips planned for this season with the club. I will be in the Istmus next wednesday to drink some free booze at the Reef, the SCICo is buying for the Corsairs to celebrate our new lease. Then I'll be in Emerald for the next week. Hope I don't miss Shawn's reports on the "Indigo" thread that starts out blaming me~~ouch.
Thanx for the info you provide. It is amazing how much "other" knowledge is gleened from this site and our precious lil beasties the A-4.
I might see/meet Hatch this weekend as the SS boat he is crewing will be racing just up the channel from my slip in Alimitos Bay~cool.

See ya soon maybe.
Dave Neptune
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