8N 6V Generator Schematic

Bobby, Sounder' has given you the easy Solution! If getting a Ford B Type Regulator is not an option, you can rewire the Gen.

The Field Winding only has 2 Wires but they MUST be correctly wired with respect to "hot" side and "Ground" side. (You can't swap ends)

If you have a "B" type generator the "Field" connection is the "HOT" side of Field winding. That internal or External connection MUST remain the HOT side of the winding regardless of Class.

The easy solution is to create a BI-Class Generator by leaving the Hot side of the field connected to the Field EXT Terminal, and mark it "Field HOT".

Then open the Gen and locate the other End of the Field Winding (opposite pole Side, the pole windings have a wire connecting them together do NOT touch)which will be connected to the FRAME Ground. You need to remove this wire from the Frame and route it to a NEW external Connector, this connector Terminal (isolated from frame) is then marked "Field Ground"

You now have Both Ends of the Field Winding on External Connections.

Class A: You connect "Field Ground" to the Regulator "Field" Terminal,and use a Jumper to connect "Field Hot" to Generator Armature Post.

Class B: You Connect "Field Hot" to the regulator "Field" Terminal, and use a Jumper to Connect the "Field Ground" to Generator Frame.

The Ford Regulator uses a 30 ohm resistor which is switched into the Field Circuit path to control voltage. The Lucas Gen may require a different Value.

If you understand how to make the Generator BI-Class, wiring it as a FIXED Class is easy.

Hope this Helps,

The only Issue I see is current regulation. In some cases, the lucas gennies are not rated for the same current output as a ford counterpart.. In my case i had a 20a rated lucas genny running on a ford vreg that would only limit at 25a.. my soloution was simply to 'be mindfull' of my electrical loads.. IE.. don't place more than 20a of loads on the electrical system.

Startup charging / replenishing of the batteries can be current controlled by throttle, as gennies don't charge great at lower rpm. he can keep his genny under it's rated charge rate by merely watching the amp gauge for the first minute or so till she starts to taper down after starting. then full throttle should be fine.. as long as he watches his overall electrical loads.

If he can get the B circuit reg.. my vote would be to leave it fixed B class. vs trying to install an insulated gromet thru the casing and perhaps mucking something up... That OR switch to A circuit ... obviously the B circuit reg will be the EZ route.. with the a-conversion just being a wire swap job..

Soundguy

Save yourself lots of wireing.

In any case.. On B circuit.. the field is grounded on one side, and the field ont he other side connects to the insulated stud on the genny casing.. and recieves field power from the B circuit regulator.

On anb A circuit setup, on eone sid ethe field is tied to armature, and the other sie is tied tot he insulated field stud on the genny casing, and recieves field ground from the A circuit regulator.

The 'A' circuit stopped being used in late 52 when the switchover to the NAA occured... and they went to 'B' circuit.

My advice is to leave it as a B circuit and get a B circuit regulator..

Soundguy