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Alternator Wiring or Failure?

Your old Chris-Craft electrical system can be a challenge. If it runs on "juice" pose your questions and offer your advice here.

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Mark Christensen
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Alternator Wiring or Failure?

Post by Mark Christensen » Mon May 27, 2013 1:29 pm

I have a Delco 19020608 on my Indmar engine. I am not getting any output from the alternator and it looks brand new. I know some alternators need to be wired such that they get "told" to turn on. I'm thinking that it was wired wrong from the beginning. The back of my alternator looks like this. The only wires that are hooked up are the B- and B+, not the battery sense or ignition into that plug area. I'm thinking I need to hook that up. Any thoughts?
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1961 24' Chris Craft Sportsman - CUA-24-0007C
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Re: Alternator Wiring or Failure?

Post by sproat3 » Thu May 30, 2013 11:57 pm

Mark-
You are correct, it will not work with only the 2 wires connected, because it needs to have 12V to the rotating field in order to make it work. You need to make the following connections:
B+ Output is the 12V output of the alternator and goes to the positive terminal of the battery. B- is the ground. Assuming they are already connected correctly, the black Ignition + wire needs to be connected to the On terminal of the ignition switch so it gets 12V to power the rotating field. The red B+ battery sensing terminal needs to be connected to a connection on or close to the positive battery terminal. This allows the alternator to sense the actual voltage at the battery and regulate its output to maintain optimal voltage.
Give it a try and let me know how it goes.
Ward
1960 Chris Craft Capri (Tahoe Heidi)

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Re: Alternator Wiring or Failure?

Post by Mark Christensen » Sat Jun 15, 2013 4:45 pm

Ok still no luck. I sprung for a new alternator. I think it's just a one wire alt though. I cannot for the life of me find a wiring diagram for this alternator. Does anyone have anything that could help? I bought the same model I had. When I pull the positive battery terminal the engine dies.... Help!

http://www.amazon.com/Alternator-190206 ... B0094JI2MQ
1961 24' Chris Craft Sportsman - CUA-24-0007C
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Re: Alternator Wiring or Failure?

Post by JimF » Sat Jun 15, 2013 6:00 pm

Found this on the web. Might be right?
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1930 Chris-Craft Model 100 20' "MOXIE"
1940 Chris-Craft Red and White 25' "Old Paint"
1946 Chris-Craft Sportsman 25' "CinCity"

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Mark Christensen
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Re: Alternator Wiring or Failure?

Post by Mark Christensen » Sat Jun 15, 2013 6:05 pm

That's what makes me think mine is not a one wire. I do in fact have two wires connected. One to a "p" an that reads 12v at all times. Then I have a "bat" wire hooked up that also reads 12v at all times.
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Re: Alternator Wiring or Failure?

Post by sproat3 » Wed Jun 19, 2013 12:18 am

gmregulator.jpg
Mark-
Is there a voltage regulator in the circuit? I assumed based on your picture that the alternator is internally regulated. If there is a voltage regulator on the boat, use the circuit above to wire the regulator into the circuit.
Ward
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1960 Chris Craft Capri (Tahoe Heidi)

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Mark Christensen
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Re: Alternator Wiring or Failure?

Post by Mark Christensen » Thu Jun 20, 2013 12:33 pm

There is an internal regulator, which is why I'm perplexed. If it's internally regulated then why do I have to have all these other wires running to it?

Here are some more pictures of the back of it. When I bought the boat it only had 2 wires going to it. The spade plug and the positive wire.
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farupp
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Re: Alternator Wiring or Failure?

Post by farupp » Thu Jun 20, 2013 3:56 pm

Mark: be sure it's a marine-rated alternator. It doesn't look like one. And confirm that it is for your engine as it could be one that fits numerous applications.
Frank Rupp
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Re: Alternator Wiring or Failure?

Post by drrot » Thu Jun 20, 2013 6:45 pm

Mark,
There is a difference between Internally regulated and "One wire". It probably needs to sense voltage from somewhere to get excited.
Jim Staib
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1947 Penn Yan 12' Cartopper WXH474611
1950 Chris-Craft 22' Sportsman U-22-1532
1957 Chris-Craft 26' Sea Skiff SK-26-515
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Re: Alternator Wiring or Failure?

Post by sproat3 » Fri Jun 21, 2013 10:49 pm

Mark-
The terminal marked "P" is a partial voltage terminal used in some auto applications. Don't wire anything to it.
The plug-in terminal is marked "I" for ignition one side and "S" for sense on the other. Wire the "I" terminal to the ON contact on the ignition switch so it has 12V on it when the ignition switch is in the ON position. Wire the "S" terminal on the positive side of the battery or close to it.
Ground the big terminal on the side, and connect the big bolt terminal on the back to the battery or battery connection to the ignition coil.
That will make it work.
Ward
1960 Chris Craft Capri (Tahoe Heidi)

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Re: Alternator Wiring or Failure?

Post by charlesquimby » Sun Jun 23, 2013 8:01 pm

So, I am still waiting for an answer to Farrup's question regarding the alternator type. Marine service or not? I'm betting not. There is also an interesting discussion on Buzz regarding non-marine service bilge blowers. An automotive style alternator will work fine in marine service, sorta like a blasting cap works fine with dynamite...Charley Q

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