Four extra lights eh? I hope you used a relay to feed power to them. The electrical system and wiring on these old tractors is not adequate for even the factory installed lights. Battery connection on light switch frequently overheats, corrodes and makes for a bad connection.
The factory generator was IIRC only 25 amps. Five factory installed lights plus the ignition is about 20 amps, so not much left to run extra lights. Turning on the lights could pull down the battery voltage enough to where the ignition quits.
If not already done, you need to get this tractor converted to a high output alternator (three wire) along with some heavier duty wiring.
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