12 volt 50 W light bulbs

I have been helping a friend with a Farmall B's lighting system. We are unable to find the 50w light bulbs that are in the headlamps and rear work light. Please advise. Joe Lallande 989-356-9816.

For 12V, the bulbs are standard 1156 bulbs, available at any auto parts store or Walmart.

For 6V, the bulbs are 1141. which are a little harder to find, but I did find mine at the local Advance Auto Parts.

might try a old car parts store, one that has been there forever, i used to work at one that was started in 1946, the owner got home from fighting wwll, and opened it, in a big box upstairs was all the old lites from the 50;s ect, nobody asked for any but 1 or 2 times a year, but a lot of old parts stores will have something like that [ this guy has since passed on and i have no idea what happened to that box,] also look in a catalog like grote, ect while in there, they might be available special order , if not might try tm tractor parts online

The replacement bulbs for the non-halogen fog lights work good in tractor lights. These bulbs are for the cheap fog lights. I don't have the bulb number. I think they are rated at 50 watts. A good auto parts place should have them in stock.

(quoted from post at 05:13:44 10/08/10) For 12V, the bulbs are standard 1156 bulbs, available at any auto parts store or Walmart.

For 6V, the bulbs are 1141. which are a little harder to find, but I did find mine at the local Advance Auto Parts.

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No, that is wrong. The 6 volt bulbs are 1133, and the 12 volt bulbs are 1143. The 1156 bulbs are smaller tailight and turn signal bulbs, and do not have nearly the same candlepower. Just do a google search for 12 volt, 1143 bulbs.

If you have the stock Guide lights that take single contact bayonet base bulbs:

6 volt 32 candlepower, 24 watts = 1133 "stock" IH # 103 643
6 volt (actually rated 5.5 v.)50 candlepower, 34.5 watts = 1183
12 volt 32 candlepower, 25 watts = 1143 "stock" IH # 142 458
(1156 is 32cp also, 27 watts, different bulb shape and filament design)
12 volt 50 candlepower, 37.5 watts = 1195


And here's one will almost definately melt your wiring: 13 volt 86 watts =1039 (aircraft bulb). I would suggest you not try this bulb. They're not long life bulbs anyway. A friend had a MD that he evidently wanted "stadium lighting" on and tried these. 1 light switch, 3 reflectors, and a big chunk of wiring harness later he was back in business.

Candlepower and watts are not the same thing, and I don't think there is a direct mathematical formula to convert the two. Candlepower is an "old" rating, watts is a newer rating.

I think one of the major aftermarket tractor parts companies were selling 1129 bulbs as 6 volt replacements. These are only 21 candlepower. 1141 is 12v 21cp.

Locally, auto parts stores stock only the 1156 of the above, the 1133 and 1195 can be special ordered and the NAPA store (handles Wagner bulbs) tells me the 1183 and 1143 are no longer available. 1183 is in the paper books, NLA when they try to order them. They all can be found online, though.

REMEMBER: brighter bulbs means more draw on electrical systems. Generators and regulators may neeed adjustment, some alternators may not put out enough amps, and some wiring may not be heavy enough to take the extra draw. The heat can melt solder also. I've had trouble with the factory wire in the 6 volt lights melting solder out of the contact when using 1183's. Bulb life can be shortened by the excess heat inside smaller than designed for enclosed spaces. Please don"t shoot at the messenger if any of the above happens to you.

Worn or burnt out or dull reflectors or dirty glass won"t be helped by brighter bulbs.

Andrew Ginter

(edited to add/clarify wattage, candlepower, and voltage ratings)