SIO Alt.

sam in mo · Mar 1, 2011

Does anyone know how to tell if a Alt. is a SIO or some other mod.?Number on the case is 1106665 408-12v neg.It is a Delco. It is on a 175 MF with tac. drive on the back. Thanks Sam

Bob · Mar 1, 2011

I don't think you mean SIO!

The possibilities would be an EXTERNALLY-regulated 10DN...

<img src = "http://www.gondtc.com/~blweltin/Bob/Delco10DN.JPG">

Or, an INTERNALLY-regulated 10SI... (Ignore the wiring for now, just look at the alternator.)

<img src = "http://www.gondtc.com/~blweltin/Bob/AlternatorHarness.jpg">

karl f · Mar 1, 2011

Likely it is a 10DN Delco, which has an external regulator, as very few other Delcos had an external tach drive. Aftermarket part number of the regulator is VR103 (Standard Brand).

the part number to use to interchange is only the 1106665.

a place for alternator or starter lookup/crossover is http://www.wilsonautoelectric.com/
you can interchange the wilson number at a parts store.
karl f

sam in mo · Mar 2, 2011

Thanks for the replys. My alt dosent look like that on the back side. It has the main batt stud on the right back,two spades sticking straight out the back marked( F&R )and a ground wire to the block from the lower left side of the case.It also has a wire running from the (F) spade to a cut out relay, is that right?It charges all the time,(heavy charge).I am afraid I am going to blow the battery up.

Jon Hagen · Mar 2, 2011

That "Cutout" connected to the F terminal may be an early Chrysler mechanical alternator regulator(60-67) They work pretty well on a Delco 10DN like yours. It should not charge hard at all times unless the battery is low/ bad / shorted, or the Chrysler regulator is defective,not connected (mounting bracket) to a good ground or the switched 12V power to it has some resistance and voltage drop. Check voltage at the battery posts with the alt charging, it should not / must not be over 14.9 volts.

The chrysler mechanical voltage regulator has only two terminals, the one with a screw goes to the alternator F terminal. The flat blade quick connector terminal goes to switched 12V power from the ignition switch. Make sure this regulator connection is made before, not after any ignition ballast resistor.
If this connection is made on the downstream(coil) side of a ballast resistor, it will send a false low voltage signal to the regulator and cause the alternator to charge flat out all the time. (make sure there is atleast 12V at the flat blade terminal of the regulator with the engine running.

Jon Hagen · Mar 2, 2011

Click on this link, the first regulator shown is the Chrysler mechanical type used from 60-69.
Is this your "cutout" ? If so it will work on your alternator if it is in good condition and wired correctly.
Chrysler regulator.

SIO Alt.

sam in mo

Member

Bob

Well-known Member

karl f

Well-known Member

sam in mo

Member

Jon Hagen

Well-known Member

Jon Hagen

Well-known Member

Similar threads