7U gen,reg,batt questions

MHG

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Hello, I am reconnecting the generator, regulator,and battery to see if it will charge. What is on the tractor does not appear it match the diagrams in the operators manual and I can see only one mark on the generator. I am assuming batt terminal on the regulator goes thru the ampmeter to the + post on battery. Arm goes to A on generator. That leaves the field terminal on the reg and 2 posts on the gen. 1 gen post has what I think is a ground bar to the gen case the other appears to be insulated. Which post does the field go to, do either the reg or gen need to be grounded and how do I polarize the system? Thanks in advance for the help.
MHG

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Sat, Nov 20, 2010 10:56 PM

Old Magnet

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I'm sort of guessing as to which system you have but it seems like the Bosch generator/regulator which uses the attached diagram.

Polarizing is done by momentarily touching the terminals with a jumper as shown by the dashed line.

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Sat, Nov 20, 2010 11:47 PM

MHG

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Reply to Old Magnet:

I'm sort of guessing as to which system you have but it seems like the Bosch generator/regulator which uses the attached diagram.

Polarizing is done by momentarily touching the terminals with a jumper as shown by the dashed line.

Hi OM. What's puzzling me is that I know next to nothing about charging systems so 2 more questions. Your diagram shows a wire from FR to the regulator. On my reg there is no extra terminal or is that just the mounting screw? Also can't see any marking on the gen but it appears that the FL and FR terminals are reversed. Thanks for the help.
MHG

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Sun, Nov 21, 2010 1:50 AM

ccjersey

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If one of the field terminals has a ground strap, connect the regulator field wire to the other one and see if that will work it properly. Remember to polarize the generator before starting the engine for the first time. A dedicated ground run back to the regulator is more reliable than depending on a circuit through the generator mounts, the engine block, the regulator mount bracket, the ground strap that bypasses the resilient mounts and finally to the regulator base.

Some regulators have that side terminal, but even on the 24 volt models where it's labeled A2 and connected to a second armature terminal on the generator, it is still grounded. So run a ground back to the regulator base from the grounded generator terminal.

I've always done it the way OldMagnet shows, but the operator's manual says to take the field wire off the regulator and touch it to the BAT terminal. I'm guessing they are just taking the regulator out of the circuit to ensure there is no damage to it from a shorted generator field etc if you polarize through the regulator.

D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time😄

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Sun, Nov 21, 2010 4:32 AM

Old Magnet

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Reply to MHG:

Hi OM. What's puzzling me is that I know next to nothing about charging systems so 2 more questions. Your diagram shows a wire from FR to the regulator. On my reg there is no extra terminal or is that just the mounting screw? Also can't see any marking on the gen but it appears that the FL and FR terminals are reversed. Thanks for the help.
MHG

The FR is just a ground for the FRame. If there is no terminal on the regulator then ground it to the regulator mounting screw. Its redundent to the grounding through the generator mounting.

I suppose the FL/FR terminals could be reversed but the connections must be correct so that FL on the generator goes to FL on the regulator.

Can you get any numbers off the generator and the regulator?

Had to check the Bosch bible....The buss goes from FL to ground for clockwise rotation and from FR to ground for counterclockwise rotation so in your case FR is the field terminal.

ccjersey is correct....per Bosch they recommend all wiring connected except the field connection.
Then touch the generator field FR or FL cable momentarily to the regulator "Bat" terminal to polarize.

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Sun, Nov 21, 2010 4:34 AM

MHG

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Reply to Old Magnet:

The FR is just a ground for the FRame. If there is no terminal on the regulator then ground it to the regulator mounting screw. Its redundent to the grounding through the generator mounting.

I suppose the FL/FR terminals could be reversed but the connections must be correct so that FL on the generator goes to FL on the regulator.

Can you get any numbers off the generator and the regulator?

Had to check the Bosch bible....The buss goes from FL to ground for clockwise rotation and from FR to ground for counterclockwise rotation so in your case FR is the field terminal.

ccjersey is correct....per Bosch they recommend all wiring connected except the field connection.
Then touch the generator field FR or FL cable momentarily to the regulator "Bat" terminal to polarize.

OM and CCJersey Thanks for the help. I work on charging systems so rarely that I forget what little I did know.
Thanks again
MHG

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Sun, Nov 21, 2010 7:16 AM

7U gen,reg,batt questions

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