4020 Electrical issues

- Oil light works ONLY when lights are on
- Fuel gauge goes from pegged on "E" (voltage?) to "F" when lights are turned on.

I repaired a couple wires that were touching & of poor quality by the light switch.

Then flasher started working, but, ALL the lights start to flash -- including oil lamp! Not the flasher itself, or its ground, I have a spare and that didn't change anything. Flasher only, flasher was really bright. May have burnt that out, will check today.

Right (as sitting) battery had a bad negative terminal, arced real bad, replaced, now no flasher, oil lamp & fuel gauge still same as above, no flasher, but could be burnt bulb.

I know I need to ground the fenders, yet, in testing, did run temporary grounds & didn't seem to make any difference.

This is definitely saying something, but what? Please don't suggest switching to 12 volt, it's not my tractor, I'm just renting if for the season, and a little elbow grease to make things work will make the guy kind on my rent.

Something I find curious: Gen light & temp guage never go "funny". Where are they at in the circuit that that's the case?

What kind of isolation testing can I do? I tried isolating the lights, but running one wire direct, no lights at all. I've got the 3000 series service manual, but light on diagnostics running down this type of issue. If I wanted to know why the cigarette lighter doesn't work, well, then I've got a procedure :^). Acutally it's quite good, and all the wiring diagrams are quite helpful.

Thanks mucho for any clues, insight, et al!

Before improving this ground: One bright light on LH, 3 very dim ones & no blinker.

After: The one was "less bright" (overbright?), and other three were reasonably bright & blinker started working.

I wonder if somewhere I have a wire in the harness (most probably to fenders/back) that's grounding out some? Would that give this kind of behavior?

Thanks again!

SMT