The headlights on my 1965 JD 4020 Diesel w/24v starting system are not working. They worked briefly when I bought the tractor at a sale last March. However, upon replacing the batteries I noticed the lights no longer work. I was careful to replace the batteries as I found them with one side grounded positive and the other negative. I get voltage at the light switch on one of the headlamp terminals on a voltmeter but only very intermittently. I took off one of the lights and rigged it to one of my other tractors, sure enough it works so its not the lights themselves. Tractor otherwise starts just fine and batteries show charge of 13+ when running, but the generator light does not work. I am not much for electrical work so I would appreciate any advice on what obvious problem I am overlooking. Should I be thinking defective switch, grounding issue or something else entirely? Thanks,
Pete
Pete