Altenator..Round or square back

[moparfanUSA]

Does anyone know for sure if a 69 440 with air, used the round or square back design? the new retro is only made with 50 amps in a double pully design. I think it came from the factory with a 65 amp. I cannot find much info on it. Any Idea?

 

[Slantsixdan]

All Chrysler-built alternators through '71 were of the roundback design. All '60-'68 units are single-field. The '70-'71 roundback units are dual-field, and the '69 Imperial (plus other '69 Chrysler models with 60A alternator) uses a special variant that does not interchange electrically with either the '60-'68 and rest-of-line '69 models or the '70-'71 models, but all of these are the roundback design.

In '72 the rear housing was redesigned (squareback) to accommodate the new bridge-type rectifier diode trio assemblies.

(To clarify, all '70-up alternators are dual-field).

A dual-field alternator can easily be used on a pre-1970 vehicle without any other modification by simply connecting one (either) of the alternator's two field terminals to ground.

What to buy depends on what your goal is. Are you building a show car that needs an alternator correct in every detail so you don't get points deducted? Or do you actually drive this car?

 

[Budnicks]

Round back

 

[moparfanUSA]

Great, just what I needed. I thought that it used the round back design, as like the one in my car now. So I brought one, the only difference is it's 50 amps, not 60 like the one it came with. With an A/C car it might be to little.
Hard to find a 60 or 75 amp double pully one.
Thanks Guys

 

[Budnicks]

Summit Racing has a Powermaster 75 amp. round back Chrysler alternator equipped with a twin V-belt pulley... Some of the aftermarket alt.'s come with 2 fields you just need to ground one to the alt. body/housing, they come with instructions usually how to do it, it's pretty simple...

 

[Slantsixdan]

Brand new (not "remanufactured") Chrysler alternators (real, not Chinese copycat) in a variety of amperage ratings and single or double pulleys can be had from Old Car Parts Northwest.

 

[moparfanUSA]

thanks SS