Light bulb problem

[Jimerjam]

So I recently installed some new lightbulbs after the old ones burnt out, I thought the old ones burnt out because I accidentally used the 12 volt setting on my battery charger, but this time they burnt out after about an hour of use, and they did not just burn out, the posts that hold up the filament in the bulb melted, so it has something to do with the electrical system on the tractor itself. Curiously the rear bullet light did not burn out, only the front lights. I need help fixing this problem

[Jimerjam]

The tractor is 6 volt, and there where some Weird brown stuff stuck to the filament posts, filament, and rolling around the bulb.

[Jim Becker]

From your previous posts, I understand you have a '48 Cub with the original charging system. If so, your generator has a cut-out mounted on top of the generator (rectangular box with a couple wires attached). Please verify that.

If the above is correct, and you have a WORKING charging system. If you have a bad (possibly intermittent) connection for the battery, it could cause the bulbs to blow out. If the lights are turned on when the battery connection fails, voltage from the generator can go nuts and blow the bulbs.

For this scenario, the bad connection is probably somewhere between the starter switch and the ammeter.

[tst]

also check the charging rate with a voltmeter, if it is overcharging a lot that could happen, make sure you good grounds also

[Jimerjam]

Thank you, I think you may have solved the problem, today when I was out driving, I came back to grab some lunch, when I came back out the starter would not turn, it turns out that somewhere along the ride, the negative terminal on the battery came out, considering I had the lights on for a portion of that ride... Well you made me out 2 and 2 together, turns out my own stupidity broke the bulbs yet again.

[tim52]

The “brown stuff” is likely solder flux from the bulb posts melting. It can be cleaned off with rubbing (methyl) alcohol.

[Scrivet]

..... If you have a bad (possibly intermittent) connection for the battery, it could cause the bulbs to blow out. If the lights are turned on when the battery connection fails, voltage from the generator can go nuts and blow the bulbs.......

I can personally verify this, bought a Farmall H a few years ago and got ready to drive it home. Wouldn't turn over a lick, so we jumped it and I drove it home (still had a magento). Turning into the drive way it was getting dark so I turned on the lights. I had three camera flashes go off in rapid sequence. What I didn't know at the time was there was a battery disconnect that didn't get turned on. The generator was pumping out it's max 30-40 volts or whatever with no where to go because of the open battery cutoff, until I turned on that light switch.

[John *.?-!.* cub owner]

I did a little testing on my 49 with original cutout once. With battery disconnected, on low charge at about 2/3 throttle I was showing 31 volts. Needless to say I did not run it long, and I did not try the high charge position.