BO light switch on fender mounted tracks?

[andy]

Ok, I think I have most of my electrical figured out. To start I have the fender mount headlights. I have 2 schematics for headlight wiring. TM9 1710c  shows no B.O light in it but looks like its right for the rest of my white, but in TM9 707 it shows it, but looks like non fender mount lights in pic. Did the fender mount lights have that BO light switch?? I am using a french wiring harness, and was told it was for fender mounted lights. Also, on this harness it has the BO and rear taillight on one circuit, where as the BO switch diagram has them separate, does the BO light switch only work the front little BO lights? I guess I can separate them. Does the resister on the firewall work at 6v for the BO lights on front?

Thanks
Andy

[spec4don]

Andy, Steve 1973 could probably answer better but I believe that the black out drive circuit for the fender mounts is basically same as the pedestal mount lights. only the front driving light is 6volt. I suspect that was done because most of the vehicles (like jeeps) were 6 volt so the didn't have to carry 2 different voltage lights.

Don G.

[steve1973]

Andy,
Here are the two schematics with fender mounted headlights. The early one uses a glass fuse block where the later one uses the circuit breakers. On bothe schematics the BO light is omitted. Not many halftracks from what I can tell had them.





The wiring for the BO light is simple. One wire from BO light to resistor to BO light switch to fuse panel or circuit breaker. That's it. Simple. Depending on the wire harness you may have to add this. Hope this helps.

Steve A.

[andy]

simple. thanks Steve  But arnt the BO lights on the front 6v? I have the resister on my firewall. In those diagrams as you said there is no BO light switch. Is that a typo or are there 6v and 12 v BO lights?

Andy

[spec4don]

Andy, the markers are 12V. I have seen pictures of a blackout guide light/ driving light which are the same as like on the jeeps. They were 6V. The tail lights are 12V. Look at the wiring diagram for the pedestal lights and the would be how it would be wired.

Don G

 

[steve1973]

Don is correct. The pedetal light schematic does show the wiring of the BO light switch, resistor to the BO pedestal light assembly. This is the same light bulb but different housing. Also, per schematic the BO light switch ties into the main light switch.



Here are some photos of the correct BO switch.

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[HenryVIII]

Looking at the picture of the blackout switch above makes me ask are there 2 different blackout switches used? I have a blackout switch that has 7 connections on it same as in the wiring diagram and it is a 4 position switch (Including off). one position is marker lights, one is service lights, and one is blackout lights. or something like that. I have 4 early parts vehicles all with fender mounted lights and they all had the same 4 position switch. Did some vehicles use 2 switches instead of just one. I have not seen a 2 pole blackout switch before.

Henry   

[spec4don]

Henry the 2 pole black out switch is used if you have a  BO guide light/ driving light. When you pull out to the first position on the 4 position switch that powers the BO markers and BO tail light. it also powers the 2 pole switch. You then turn that switch on to power up the the guide light going through the resister to drop it down to 6 volt.

If you look at the picture of my dash you can see the 2 lights. I do believe some of the fender mount models were retro fitted with a guide light.

Don G.

[Torque]

Don, can you post a good picture showing the location of the 2 light switches. My dash was cut and the replacement did not have the B.O. light switch. Thanks

[spec4don]

Torque, here you go, it's a little pixelated but I think it gets the point across. If not let me know and I'll take another clearer one.

[HenryVIII]

Thanks Don for the info and pics. There is no hole in my dash for a second switch. am thinking what I thought were the blackout lights were really the blackout marker lights.

Henry

[spec4don]

Check this link it has some pictures of the driving light added to an early halftrack:

http://www.odfever.com/folly/Galleries/walkaround/walkaround.htm

Here' Rich's website, may be contact him and get som more detailed shots of the dash and the light.

http://www.odfever.com/folly/folly.htm

Hope this helps

Don G.

[Outsider]

Here is a picture of my black out light,and one of my dash. This is a M3 Autocar.





As I understand it ALL ht's with fender mounted head lights had the black out head light mounted to the radiator armor.

Steve

[Outsider]

Here are some wiring diagrams for the fender mtd head light ht's. The last diagram is one I did to install blinkers on my ht.







These are the diagrams I used when I was working out how I wanted to build my wire harness.

Also did some digging on my ht. The wiring for the blackout head light does not run in the standard loom. It is a separate wire that runs from the blackout head light switch on the dash to the resistor mounted on the firewall, and then from there it runs in it's own loom to the black out head light along the frame rail. Just for reference almost all the wiring under my dash is original. The only wiring I did was from the firewall on. Just looking at my homemade drawing it is missing the wire running from the brake light switch to the blinker switch.  I know if I scrounge around here some more I will find the final homemade wiring diagram I did to wire my ht.  If you want you can call me if I can answer any questions for you.

Steve
231-206-2937

[andy]

I was thinking of installing those taillights that they use on tow trucks when towing cars, the lights with magnets as a separate wiring setup that when parked could be removed and stowed away.