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The headlight symbol is for high beam. The power from CB70 goes thru the light switch to power K7/headlight relay when you turn on the light switch To service drive. Since the ignition and headlight switch use CB70 power, and the truck starts and runs, your source power is OK. If K7 should...

I would make dropping to two batts step 1, you can do it today, lift the leads off of a front(toward front of truck) or rear pair of battery posts and insulate them... The LBCD controls the charging system warning light. This function could be recreated with an off the shelf voltage sense...

Geo is right, a 24v charger will not charge equally pulling 12 out of the middle. But it will work ok for a short time to get you home. A pair of 12s would work better as long as they are not grounded/ground referenced(metal cases/3prong AC plugs) plastic cased chargers with 2 prong...

When Neihoff lists only one current spec, it was the combined total. Where they list two currents that is where they have altered the construction so one side is carrying significamtly more than 50% of the total current. The 1505 lists 100/40 for 28/14v like you mentioned, but we dont use the...

It doesn’t even do that. It is 100A total!,, about 60A@12 and 40A@24 max… Thats why a straight 100A delivers 25-30% more power than this 60/40 abomination…

This right here! The amount you will spend on a Neihoff reg or any other repairs you might need will put you a long way along the road to a commercially available 24V alt and 24-12 converter… one real killer of the capability of the 100A dual volt is pulling half the power out of that first...

I would be curious what you see at the 28v output terminal. The reg regulates the field based on the 28v output. That rotating field excites 2 series wired 14v windings to create a 28v output. It creates the 14V from the first winding like a switching power supply using SCRs instead of diodes...