Voltage Regulator Question

RTR · Oct 5, 2015

Going tomorrow to pick up the rebuilt generator for the 424 diesel tractor and now I'll be able to further diagnose the charging system per JohnT's directions. I'm predicting that the VR will not be working but hopefully it will be ok. I noticed that the Voltage Regulator is much larger in size on this tractor than say one from a Farmall 140 like I usually work on. Is that just because it is a heavier duty VR? Reason I ask is because I have a new VR for a 140 and didn't know if I could replace it with that one if its bad. OR....should I try and get an even equivalent to the one on it ......OR if it's bad can I repair the original Delco Remy one on it? The tractor has the factory charging system on it (12 volt generator negative ground, just like on a Farmall 140).

RTR · Oct 5, 2015

(quoted from post at 08:12:46 10/06/15) Going tomorrow to pick up the rebuilt generator for the 424 diesel tractor and now I'll be able to further diagnose the charging system per JohnT's directions. I'm predicting that the VR will not be working but hopefully it will be ok. I noticed that the Voltage Regulator is much larger in size on this tractor than say one from a Farmall 140 like I usually work on. Is that just because it is a heavier duty VR? Reason I ask is because I have a new VR for a 140 and didn't know if I could replace it with that one if its bad. OR....should I try and get an even equivalent to the one on it ......OR if it's bad can I repair the original Delco Remy one on it? The tractor has the factory charging system on it (12 volt generator negative ground, just like on a Farmall 140).

Here is a picture of the VR on the IH 424-D

Bob · Oct 6, 2015

It's a 3-unit regulator vs. the 2-unit the older tractors typically used. I wouldn't consider it heavier-duty, just was the style that was popular at the end of the generator era.

John T · Oct 6, 2015

I think Im in Bobs camp. Some VR's had 2 coils others had 3. Some had individual Voltage and Current Control Relays plus the cutout relay (3 coils) while others had a combination voltage/current relay plus the cutout (2 coils). Also some were 4 terminal (BAT LOAD FLD GEN) while others had 3 terminal (BAT GEN FLD).

John T

Tom Fleming · Oct 7, 2015

and baby makes 3 (with Bob and John)! Just call me Baby!

Voltage Regulator Question

RTR

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RTR

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Bob

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John T

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Tom Fleming

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