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Old 06-12-2003, 07:34 PM
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1 wire alternator problem

Against my better judgement, I ordered a chrome 1 wire alt off of eBay, brand new.
I installed it today, and it is only putting out 12.75 VDC for some reason...

Funny thing is, the "no charge" condition, is the reason I bought a new alt... coincidence??

any ideas?

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Old 06-12-2003, 09:13 PM
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need a little more info-- have you driven the car after installation of new alt. or just idled in the garage? most one wire alternators will not kick in and charge until 1000 or more rpm. could be bad alt. from supplier . also check to make sure you have battery voltage at the one large terminal on the alternator. if no voltage then no charge. hope this helps
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Old 06-13-2003, 05:30 AM
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ya, I kicked the revs up more than a few times..
it does seem to charge to about 12.75 and stay there...
I grounded the v. reg. tab to the alt. case, and the volts did shoot up...
I'm almost wondering if the chrome plating is preventing the v. reg. from grounding properly???
I used 8 gauge wire from the bat. to the alt.
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Old 06-14-2003, 05:31 AM
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you can try running a jumper wire to the # 2 terminal on the alt to the battery terminal on the alt, this may be hidden under a rubber push in plug on the side of the alt, See if your volts go up, if so thay have the wrong regulator in the alt.
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Old 06-14-2003, 09:17 PM
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if still no luck after doing diagnostics on the car, you can take that alt. to your local starter/alt. rebuilder and have them test it if you have no local rebuilder then most napa,carquest,autozone or advance auto should be able to test it for you.
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Old 06-14-2003, 09:21 PM
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i figured it out guys!!
I hooked the #2 terminal to the "bat" terminal, and it started charging!!
so then I rewired it so that the #2 terminal is sensing the voltage right at the horn relay, so everything has good voltage!

Thanks for all the help people..
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Old 06-18-2003, 02:27 PM
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Question 1-wire schematic

Does anyone know what Terminals 1 and 2 are for, if its a "1-wire" alternator? I've had a similar problem on a '77 CJ-7 - either no or low charge. Does anyone have available a schematic for the alternator?
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Old 06-18-2003, 04:18 PM
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terminal 1 is the "exciter" terminal on a standard 3 wire, and it is basically a switched ignition lead that usually comes from the ignition switch, through either an idiot light or an ammeter, and then to the alt.
on my "1" wire, it didnt make a difference if this was hooked up or not.
terminal 2 is the "sensing" wire....
seems most time on a stock 3 wire that this just goes to the battery.
I had to connect this wire to get my "1" wire to work properly, so I guess in reality its a "2" wire???

The alternator will maintain the regulated voltage to wherever this lead is hooked to. For instance, if connected to the "bat" terminal on the back of the alt... it will maintain voltage ai that terminal. same thing when you hook it to the battery. I ran mine to the horn relay, which is where the entire car gets it power from on my car. It eliminates any voltage loss through the wires from the battery to the horn relay.

I also upgraded to a 4 gauge starter cable, 8 gauge alt to battery cable, and 8 gauge battery to horn relay cable. Should be more than sufficient in most applications.

Hope that helps.
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Old 08-09-2003, 01:01 AM
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can someone please elaborate on this subject. i too bought a chrome "one-wire" alternator off ebay. i took it into Kragen and they said it wasn't a one wire and told me something about connecting the terminal plug on the alternator to the battery on the alternator. i am very confused.

can someone please tell me exactly what the two "prongs" on the alternator are for and how to set this up on my car? Right now I have it so one wire is going from the back of the alternator to the battery, then another from the back of the alternator to the horn relay. But i do not think this is charging good enough.


Thanks!

Also can someone tell me how i might hook up an AMMETER to my car? where do the wires hook too?

Thanks, mike
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Old 08-15-2003, 05:13 PM
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GOT to be a diagram of this in the KBase i've seen it a zillion times. jump from batt to the exciter. so your second wire is like 2 inches long, you only have one going to it.
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Old 08-24-2003, 02:37 AM
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For the whole story;
http://www.madelectrical.com/electri...hreewire.shtml
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Old 08-24-2003, 06:03 AM
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mad electrical.com is an excellent source for understanding the delco i wire alternator theory
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