48 ford headlight switch HELP

I'm in the process of re-wiring the entire car and updating everything to 12 volts.
Does anyone know what wires go to what terminals on an original headlight swith for a 46-48 ford passenger car?
The switch is clearly marked. R and B on one side with P, B, and H on the other side. BUt that does not mean a thing to me
Thanks guys

 

i will guess B is battery , H is for headlights , P for park , R i have no clue. isn't there a T for tailights? maybe that R is a T? a few minutes with an ohmmeter will prove me right or wrong

vanpelt has this wiring diagram online , but i can't see how it will help

http://www.vanpeltsales.com/FH_web/...Flathead_Electrical_wirediagram1946-48car.jpg

 

Here is a link to wiring diagrams from
ford for '46 through '48 ....
Rich
http://www.vanpeltsales.com/FH_web/...pics/Flathead_Electrical_wiring1946-48car.jpg

 

Here is a picture of the back of the switch

 

looking at the diagram that whitewall tires posted , on the side with three terminals H is definitely headlights , B is battery and comes from some sort of fuse block, and P is park. on the side of the switch with two terminals R is for rear tailights.....the B also seams to connect to the battery at a fuse block

on the `49 ford i rewired with the stock headlight switch that had two B's also

 

Per the wire digram: "p" is park or running lights. "H" is headlights to the dimmer switch. "B" is battery supply from a fuse \breaker. "R" is dash lights.
With the headlight switch knob pointing at you there are three terminals on the left and two on the right. front left is headlights,second on left battery/circuit braker,third or rear terminal is park/running lights. Two terminals on right are front battery/circuit braker rear id dash lights.
hope this works for you

 

The thing that confuses most is that there are 2 battery hookups...once you realize that (true of most HL switches) all is easy.
P is PARKING lights, R is REAR or tailights...note pre-68 type function, parking lights on alone at first click, off when HL is on...Taillights have two riveted terminals because they come on both with parking lights and headlights. From memory, I believe the instrument light switch is branced off the terminal for taillights. It goes to a separate rheostat dimmer switch for instrument lights.

 

By the way, swithc is easy to overhaul, but be careful because if you drop anything you'll need an hour to figgeritout!
Pry back tabs, lift off plastic, you then have two sections of brass with terminals supported by ting springs on the sliding plastic block. Disassemble, clean, coat everthing eith light greas and reassemble. Good for 60 more years.