Hi all. I have been trying to figure out why my batteries were not holding. Turns out that I get negative reading when I hit the glow plugs and nothing on the gauge when running. Hence, no charge. I pasted the wiring diagram I am using along with my regulator. Nothing is labeled and every wire is blue. Troubleshooting steps mention terminals Batt, A, F and G. I think I found Batt which has 24v present. The other 2 terminals on that side of the regulator along with the single wire on the other side test as dead short to ground. Is there a way to tell what is A and F on the generstor?

Bat is 1
Arm/GEN is 2
FLD is 3
Ground is 4-5 bypassing the rubber isolators

Have you polarized the generator?

Neil is right. If you remove the screws and clips holding the wires on, the terminals on the regulator are stamped. Never a bad idea to clean all connections.

"ccjersey" wrote:

Bat is 1
Arm/GEN is 2
FLD is 3
Ground is 4-5 bypassing the rubber isolators

Have you polarized the generator?

Neil is right. If you remove the screws and clips holding the wires on, the terminals on the regulator are stamped. Never a bad idea to clean all connections.

I plan on cleaning it up good. I assume to polarize I touch batt to arm briefly?

That’s the usual procedure for DELCO units.

"ccjersey" wrote:

That’s the usual procedure for DELCO units.

I got it off and cleaned it. Terminals are indeed stamped. Under the cover looked perfect. What's the importance of the regulator being suspended by rubber? The little rubber bushings are gone. With a ground wire coming out the back is the little frayed ground wire needed also?

Purpose of the rubber mounting is to eliminate shock and reduce vibration.
brillman.com/product/regulator-shock-mount-kit/

Yes ground wire is needed too.

The vibration is why the regulator is almost never mounted directly on the engine or generator itself. The regulators inside vibrate as part of their normal function, external vibration can’t help!

"ccjersey" wrote:

Yes ground wire is needed too.

The vibration is why the regulator is almost never mounted directly on the engine or generator itself. The regulators inside vibrate as part of their normal function, external vibration can’t help!

I got the regulator mounted again on the rubber isolation pads. Before I connected everything I wanted to check the Arm and Field wires from regulator to generator. I found all terminals had a short to ground. I then proceeded to the generator to find the ARM and FLD terminals grounded there also. Disconnecting the wires indicated no short to ground in the wires. In short I have the generator off now and it shows continuity across all 3 generator terminals. I guess I need to open it up as that doesn't sound right.

The simple solution would be to put a gm 1 wire alternator on her. What I did with d5 98j 525. Working like a champ.