Square back alternator
- Thread starter jonnyrose
- Start date
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67Dart273
Well-Known Member
Nope. Also does not matter which field is connected to which wire on the 70/ newer ones. CAVEAT!!!! Please check before you install it that both field terminals are open to ground. There are LOTS of alternators with "magically grounded" brushes
pishta
I know I'm right....
Wait up, your using a stock regulator on a squareback? Why....upgrade to the dual field electronic regulator and dual ballast resistor. "..Dual field alternators can also be used for single field applications if necessary by grounding one of the field wires. <<67Dart273 may have found a few that were already grounded to convert to single field..;-) >> This will, in effect, turn the alternator into a single field unit..In 1970, Chrysler changed to an electronically regulated charging system. This system can be easily identified by the flat, square voltage regulator with a triangular plug on it. This is a much better, more reliable system that will keep the battery voltage more stable and is highly recommended for electronic ignition setups and aftermarket stereos/electronics, etc. This system uses two field wires and is often called a "double field" system.."
turns out the single field and dual field alternators are very much alike with the dual field breaking out its case ground to the 2nd isolated field lug only, not internally grounded. The square back was also an upgrade with the bolt in diode addition. So in theory, you could use an electronic regulator with a single field alternator if you isolated the case from block ground (use a smaller bolt and insulated bushings on the mounts) and ran 2nd field from electronic regulator to the case. Just easier to use the squareback and the 2 field lugs with the electronic regulator. There is also a safety factor with the electronic regulator that prevents a mechanical points short/harness cross from a runaway alternator voltage meltdown. The dual field electronic varies the ground potential (through the case of the voltage regulator, needs a great ground connection!) on 2nd field while keeping the input voltage at a constant feedback voltage.
turns out the single field and dual field alternators are very much alike with the dual field breaking out its case ground to the 2nd isolated field lug only, not internally grounded. The square back was also an upgrade with the bolt in diode addition. So in theory, you could use an electronic regulator with a single field alternator if you isolated the case from block ground (use a smaller bolt and insulated bushings on the mounts) and ran 2nd field from electronic regulator to the case. Just easier to use the squareback and the 2 field lugs with the electronic regulator. There is also a safety factor with the electronic regulator that prevents a mechanical points short/harness cross from a runaway alternator voltage meltdown. The dual field electronic varies the ground potential (through the case of the voltage regulator, needs a great ground connection!) on 2nd field while keeping the input voltage at a constant feedback voltage.
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How do I check if there magically grounded? Like insulators at connection points.....is that what you mean
It's just temporary, until I get the right alternator, it's all I got,came off my 1985 d150,even though the casting number comes up 1972 challenger...lol
67Dart273
Well-Known Member
Before you connect your grounding jumper, use a meter to check from the field terminals to the case. Should be open. Unwanted grounded field brushes is caused by sloppy rebuilders, broken or missing brush holder insulators/ hardware. This is quite common
pishta
I know I'm right....
Sell core to a $$ E-body numbers matching guy.
Got ya,thanks
I'd give it to them for price of shipping when I'm done with it
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