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AcC8bramanOffline
Post subject: Alternator issues - 3 wire setup  PostPosted: Oct 19, 2013 - 06:43 AM
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Joined: Apr 28, 2012
Posts: 30

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Hi all,

I have been having problems with my alternator on my chevy engine not charging the battery.

After lots of searching I have now wired it correctly and I am showing a charge at the battery, the problem was it wasn't "excited" ( had to laugh at this lol).

Now my new issue, when turning the ignition off , idiot light comes on and the engine still runs?!?!?

I have to pull the wire out of the lamp to make it stop.

Is it a simple case of adding a diode or have I done something else wrong?

Also found the oil leak there is no plug in the ancillary hole near the fuel pump.

Semi successful evening in th garage.

Please help me sort this as I need to get my IVA forms off
 
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jdinnerOffline
Post subject: RE: Alternator issues - 3 wire setup  PostPosted: Oct 19, 2013 - 11:07 AM
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Joined: Nov 10, 2003
Posts: 3075
Location: Toronto, Ontario, Canada
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You wired the exciter wire to the ignition side of the key switch. It is feeding back from the alternator to the ignition to keep it running, the same thing will happen if you wire a fan like this. You will need to run the charge light to an ACC terminal instead of an IGN terminal.
You could try a diode in the wire feeding the charge light.
IGN------>|-------bulb----------exciter.

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AcC8bramanOffline
Post subject:   PostPosted: Oct 20, 2013 - 07:52 AM
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Hi, thanks for the advice.

I have placed a diode in place and it is now working ok.

I will start her up again today and hopefully no flat battery, if its flat then I need to look else where ( its a new battery)
 
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jdinnerOffline
Post subject:   PostPosted: Oct 20, 2013 - 01:25 PM
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Joined: Nov 10, 2003
Posts: 3075
Location: Toronto, Ontario, Canada
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You alternator has 2 wires and 1 large wire, right? Make sure the #2 terminal is constantly live. It is ok to run directly to the large Bat terminal on the alternator.
The #1 terminal is the one that should be switched and have the charge bulb inline.

The check to see if something is draining the battery remove the negative cable of the battery. Connect a test light between the negative cable and negative post. If something is draining the battery the light will light up. If it doesn't light up, open a door to create a load (interior light) to see if you have a good connection.
Good Luck.

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