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-   -   One wire alternator? really not the same!! (http://www.clubcobra.com/forums/superformance/103802-one-wire-alternator-really-not-same.html)

m5extc 04-05-2010 10:05 PM

One wire alternator? really not the same!!
 
Okay, I know all of the typical Q & A that goes on regarding this subject as I have been involved as well. My question is this. I want to retain the red light by tapping into the blue wire, but have read that this will not work with an ampmeter. I have yet to figure out why or what function is lost. Is this true, and if so, does anyone know what the issue is? Please advise.

Andrei

PANAVIA 04-06-2010 02:59 AM

Large SI cased GM alternators actually have three terminals.

A> BAT+ for your Solenoid BAT+ Lug on the firewall.
B> Dual Terminal Side Connector ; look for the #1 connector this is stamped with a #1 on the case, this terminal is used to connect to the dash warning light,

--which is wired in series with a 12V+ IGN on only signal . in case of issue, the #1 terminal will *THEN* act as a ground wire, thereby illuminating the waring lamp.

give it a try.

m5extc 04-06-2010 09:56 AM

Steve,

I have tried that and it works. My question is, that I have read that you should only do this with a volt meter and never an amp meter, and I have not yet been able to figure out why or if this is even correct.

Andrei

Blas 04-06-2010 02:24 PM

An excellent bit of reading:

http://www.madelectrical.com/electri...hreewire.shtml

PANAVIA 04-06-2010 02:52 PM

The thing is , you could use the 95A Gen 3 Motorcraft and be ford-o-riffic at the same time.

Andrei -- one should not be using an AMP gauge that is UNDER the rating of the ALT.

in the case of the SPF, the AMP rating is 50/+/- -- whereas the 10SI 1 wire is atleast 90A.


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