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Re: 1964 IH Cub Lo-Boy electrical problems
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Posted by Rick K on April 23, 1999 at 12:25:48:
In Reply to: 1964 IH Cub Lo-Boy electrical problems posted by Big B on April 23, 1999 at 11:48:21:
Since there are two headlights, it is unlikly (nothing is impossible) that both grounds opened up at the same time after 35 years. I assume you have no test equipment (a $20 volt/ohmeter is worth having), so I will proceed under that assumption. Get a piece of wire about 10 feet long. A smaller guage would be better, like a 16 gauge, but not very critical, just easier. Strip both ends of the wire. READ FOLLOWING WARNING< AND THEN hook one end to the ungrounded side of the battery - probably the negative side if it is original 6 volt system. a small hose clamp would be fine to hold the wire to the battery terminal. IMPORTANT... pay attention to where the other end of the wire is. Don't let it touch anything, as it will short out the battery, and get pretty hot. The reason that I recommended a smaller wire is that it will limit the current in the event that you mess up and not blow up the battery, although it will probably get white hot if left shorted and cause a real nasty burn... END OF DISCLAMER Now you have a wire with 6 volts available at the end of it. Cubs had three different light bulb styles, so the following procedure will vary, but connect this wire to the power connection of one of the lights. Make sure you aren't hooking it to the ground side by mistake. If the bulb and ground are good, the bulb should light. Try the lamp on the other side, same procedure. If the bulbs and ground are good, follow the wire that powers the headlamps up to the headlight switch. Find the contact on the switch that this wire connects to and hook your test lead to it. The headlights should light. If not, it is the wire that goes from the switch to the headlights. If the headlights DO light in the above step...
I do not have a manual in front of me, as I am at work, but I assume that the headlight switch gets its power from the fuse. Find a wire running from the headlamp switch to the fuse holder. Connect your test lead to the fuse holder connection, and turn the headlamp switch on. The lamps should light. If not, it is probably the switch. You can confirm this by jumping across the switch with a short piece of wire. If jumping the switch makes the headlamps light, then it is the switch. If the previous step does not point to the switch, connect your test lead to the input to the fuse holder. Make sure that you have left the headlight switch turned on. If the headlights light when you connect to the fuse holder input wire, it is the wirening from the battery to the fuse holder. If not, there is something wrong with the fuse holder. Make sure that the fuse, and the contacts inside the holder are clean, and try again. If no luck at this point, it is possible that aliens are sucking power out of the tractor. or we overlooked something. Let me know what happened
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