My guess would be the light is wired to the headlight switch so it only lights when your lights are on. I don't know much about 48 to 52 trucks but the lighter has a bracket, so it doesn't have a specified spot on the dash like the 53 to 55 trucks do? So mount the bracket close enough so the light wire reaches.

 

I would wire it to the dash light switch.

 

It has an under-dash mounting. I would check for pre-drilled holes that match (I think there is a pair underneath the ignition switch). The lighter element should go to the load side of one of the circuit breakers, and like others have said, the light would go to the dash or headlight switch, whichever is most convenient. There is also a flat round spot under the ashtray where it could be installed in the dash.

 

The one that came in my 1950 is mounted to an opening on the steering column, between the wheel and the dash. I can try to trace the wires for you later tonight, if still needed.

 

 

Now that is cool! I wondered why you wanted a cigar lighter. You've installed a lot of NOS parts lately.

 

Can I use it to light my cigarette or do I have to buy a cigarette lighter?

Later!
Mr. Ed

Sorry, I just couldn't resist!

 

I am just a LITTLE envious of that light (and that's an outright lie!!). That is an awesome piece of accessory goodness right there!