1939 ford voltage regulator conversion

[koates]

Rusty, In my post #8 I explained to you how to check the generator/regulator charging voltage. Here it is again (maybe clearer). Connect your analogue voltmeter between a good ground and the generator/armature terminal at the voltage regulator. You could also connect it to the Battery terminal on the regulator for a similar test reading. Rev the engine up to about 2000 Rpm and hold it there for about a minute and a correct voltage reading here would be approx. 7.5 to 7.8 volts.. This could be somewhat dependent on the batteries condition and state of charge. If you are in that ballpark reading then it is OK. IF it is above 8 volts then it is getting a bit high and might tend to overcharge your battery on a longer drive. Kurt stated a voltage reading of 6.8 to 7.1 volts but that reading is for the cut out closing voltage which is a different adjustment inside the regulator and not related to the actual charging voltage. As Kurt said, your regulator could be the square shape two unit regulator which was a transition regulator used mostly in 1939 I think. The more common oblong shaped three unit regulator was used thereafter. It had a current regulator inside which was a better set up. Let me know what your voltage reading is and then we can talk more about it. Make sure you don't have too much electrolyte (water Level ) in the battery. About 1/4" above the plates is high enough.. These voltage regulators are tricky to repair and adjust so unless you really understand the operation of it then don't play with it. Regards, Kevin.