PN to replace 24v bulbs with 12v bulbs

[aktundra]

Checked the pinned PN thread and didn't see my answer

Can anybody tell me the bulb numbers, if I want to use my M100 fixtures, with a conversation to a 12v system ?

 

[Teddy]

Not 100% sure on the M100, but on my American M101 I just left the 24 volt bulbs in. I just converted the 24V trailer plug to 12V. They aren't the brightest lights in the world, but plenty bright in my opinion.

However, you should just be able to pull one of your 24 volt bulbs and take it in to any auto parts store and buy the matching 12 volt bulb.

 

[ntsqd]

If they are a bayonet base with offset pins and two light elements then the p/n is 1157, but if you can find them 2057's are a little higher wattage.

If they are bayonet base with equal pins and one light element then it is p/n 1156, but if you can find them 2056's.....

Armed with those numbers you can also go someplace like superbrightLEDs.com and order LED tail lights though I do worry a little about their weight wearing out the sockets from vibration.

 

[aktundra]

Thanks folks
The original bulbs were double filament. Kind of spooked me
However, double filament is not necessary.

 

[ntsqd]

Double filament is one for tail lights and the other for stop & turn signal. Not sure how you wouldn't need double filament, but OK.

 

[Living in the Past]

Do you have a picture of your tail lights? I have some early trailer lights and they had three lamps. None of them had offset pins.

 

[aktundra]

These are the lights that came in a bucket, in the back of my 1956 M100. Each fixture has 2 double filament 24v bulbs, with a single terminal on the bottom. The bulb on the bottom right is the original 24v. I could not find a double filament-single terminal replacement. However the larger single filament bulb fits, and seems to be the multi-purpose bulb I'm looking for.

 

[Living in the Past]

The pins look to be opposite not off set with one higher then the other. The dual element use the offset so the hi/low wattage elements are in the right location. Is there two post on the bottom of the 24 volt lamp? The reason I asked is I have a couple set of lights like those and they are single element lamps with the pins opposite each other not offset.

 

[aktundra]

Ok, now my mind is blown. I assumed the 3rd wire on the other housing was an additional ground, but it's a 3rd bulb on the DS. Anybody that has converted to 12v, what have you done with the 3rd bulb ?