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 Post subject: Alternator Disconnect
 Post Posted: Tue Jan 12, 2010 5:55 am 
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Ok, correct me if I'm wrong. I keep hearing about running the alternator charge wire to the battery disconnect. This would still put the wire on the same side of the switch as the ignition box. Therefore in the event of an emergency when the switch is turned off the alternator would keep powering the ignition, fuel pump etc. Wouldn't you need a 3 pole disconnect?
I'm still in the very early stages of wiring, I'm trying to get some of the wire routed before the tin work is done.
I did pick up the welding cable, and grounds and batteries are still way down the road....

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 Post Posted: Tue Jan 12, 2010 5:59 am 
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That's correct Mike and even if you put the alt wire on the other side it's going to be hot all the time =; =; ...I used a high amp solenoid and mounted it to the battery box. I think Chuck used the same one as I did. Here's a picture...

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 Post Posted: Tue Jan 12, 2010 6:01 am 
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Here's the link I got the sol from =; I used #24612
http://www.texasindustrialelectric.com/relays.asp

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 Post Posted: Tue Jan 12, 2010 7:03 am 
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Ok, the relay makes sense. I've been scratching my head as to how to disconnect it.

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 Post Posted: Tue Jan 12, 2010 7:06 am 
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Mike here is the post on the switch.

viewtopic.php?f=7&t=5437&start=0

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 Post Posted: Tue Jan 12, 2010 7:19 am 
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Mike here is a simple diagram of how my switch is wired. Remember that there is no internal connection between the large and small posts. I am running a hot wire from large to small on the battery side.


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 Post Posted: Tue Jan 12, 2010 8:34 am 
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IMO.....A # 12 wire is not big enough.... =;

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 Post Posted: Tue Jan 12, 2010 9:46 am 
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WR169 wrote:
Mike here is a simple diagram of how my switch is wired. Remember that there is no internal connection between the large and small posts. I am running a hot wire from large to small on the battery side.


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Hummm, :-k Not sure I understand how this works? Is this a one wire alternator?

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 Post Posted: Tue Jan 12, 2010 10:02 am 
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Nope just a standard GM alt. The 12 guage is for the field. The 10 guage would go back to the battery/main power. I run a 10 wire to my master panel from the starter.

Barry I have thought about going to a larger wire to the starter. But this has worked for the last 6 years, 3 of the 6 years running round robin. Like you guys say if it aint broke don't fix it

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 Post Posted: Tue Jan 12, 2010 10:32 am 
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Barry do you know if a Ford starter solenoid would work or are they not rated for continuous use? I'm sure the solenoids are a dime a dozen

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 Post Posted: Tue Jan 12, 2010 10:47 am 
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You said it......I didn't use a starter sol because of that...

On another note if you battery is in the back.....#6 wire is what I used...

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 Post Posted: Tue Jan 12, 2010 10:51 am 
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Barry, so your running #6 wire from the alt to the battery?

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 Post Posted: Tue Jan 12, 2010 11:03 am 
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WR169 wrote:
Nope just a standard GM alt.


That's what I thought. FYI, this wiring diagram WILL NOT WORK WITH ALL ALTERNATORS! It won't work with the 70amp Mitsibushi that's on my Camaro and Studebaker. Once the fields are energized on those, they will charge WITHOUT any excitation current to the fields. I had a conversation with someone about this a few years ago. At the time the Studebaker had a 60amp Delco three wire on it and I had a micro switch on there that dropped the fields out at WFO. I knew that one worked because the head lights would dim at night when I went WFO and it also showed a voltage drop on the volt meter on the dash. Those charging systems now have the 10 ga alternator output wire connected on the battery side of the disconnect switch, not the starter solenoid. When the disconnect is opened, then there is no current present on that wire going to the starter with the engine running and it will shut down.

So Mike, Steve's wiring diagram might work with a Delco multiwire alternator but it may not work with other alternators.

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 Post Posted: Tue Jan 12, 2010 11:12 am 
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WR169 wrote:
Barry, so your running #6 wire from the alt to the battery?


Steve I think what Barry is talking about is the main charging wire from the big post on the alternator. The further the run, the larger it might need to be although I ran a 10ga wire on both the Studebaker and the Camaro and haven't had any problems to date. The 12ga wire you have running to your alternator is just to excite the fields and if you look at a factory setup, they use something like 14ga on those because there isn't much current draw on that circuit. I've got 14ga on both the Camaro and the Studebaker on that circuit.

EDIT: 10ga stranded wire is good for 100 amps so with a 70amp alternator I'm only running at 70% capacity.

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 Post Posted: Tue Jan 12, 2010 11:21 am 
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Yea I assumed he meant the main charge wire. Man, I opened a can of worms here!!!

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