What the LHBD light switch does on those cutout relay ONLY (no voltage regulator) charging systems is to provide a ground to the gennys FLD post via the wire from FLD on genny up to the LHBD light switch. For High Charge its simply a dead ground while Low Charge is to ground via a small resistor located on the switch.
Soooooooo if you dont have the light switch and want the genny to High Charge you simply ground out its FLD post (rig a wire or switch etc from FLD on genny to ground) but if you want a lower charge you have to place around a 2 to 3 ohm power resistor (25 watts ought to get it) in series between the gennys FLD post and ground.
One could rig a SPDT toggle switch where one position is high charge and it connects the gennys FLD post direct to ground but when switched to Low Charge theres a 2 to 3 ohm 25 watt power resistor in series between the genny and ground.
The keep an eye on the battery to make sure its NOT overcharging evidenced by excess outgassing and/or boil over of acid. Depeninng on the load and if its a mag or coil ignition and RPM and the gennys condition and location of third brush (if so equipped) one might leave it on high charge for 30 minutews or so after start up but then switch to low charge IT ALL DEPENDS ON TEH BATETRY N GENNY AND RPM AND THE LOADS thats why a voltage regulator is best cuz it automatically regulates the charge rate.
If the tractors not ran for long periods (or the RPM is low and its a coil ignition) you may get by with simply dead shorting the gennsy FLD post so shes always in the max charge condition and/or set the third brush for a lower charge rate and just leave the gennsy FLD post permnanently dead grounded n not fool with any low charge resistor or switch.....
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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