AS usual, I agree with my sparky friends Jim and Bob so will just toss in my shortened version.
The Cutout Relay is effectively between the gennys output (ARM post) and the battery. Once the genny is running and charging it closes so the genny can charge the battery. When the tractor is shut down it opens otherwise the battery would discharge via the genny very quickly and the gennys get hot.
If it only has a cutout relay, you need a way to regulate the charge rate so the LHBD switch did that by manually setting it for LOW or HIGH charge.
The more modern Voltage Regulator had an internal cutout relay PLUS it automatically controls the charge rate so the operator doesnt have to choose between low and high charge.
If youre a purist and insist on originality you would use a cutout relay and LHBD light switch iffffff the tractor originaly had it HOWEVER if you want her to automatically charge at a more correct rate you could still use a VR even if it had the cutout originally.
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