Need a drawing for the charging system on a d4-7u. Gen will not charge the 6volt bat. Have taken regulator apart ,looks ok and brushes also ok. any ideas

tnks Doug
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sure your wiring is all in place?, no hanging wires etc? Battery disconnect switch closed (if it has one), good ground connnection on both ends of the battery ground cable.

Just for an initial check take a test light or volt meter and make sure you have battery voltage at the regulator BAT terminal with the engine stopped. Then polarize the generator by shorting between the BAT and GEN (or ARM(ature) it's sometimes called) terminals there on the regulator. You should get just a spark, that's a good sign and enough to polarize it.

You can check the generator by shorting the F(ield) terminal to ground with it running and it should go to maximum charge/voltage output. If not, there's something wrong inside the generator. You may need to have a volt meter there on the regulator BAT or the generator ARM terminal to see the voltage if your ammeter is burned out or stuck, regulator is bad, wires are broken etc.

There are several wiring schemes to choose from.....maybe these will help:)