Hmm. Inside turn signal indicators function differently with headlights on

[jocko]

Just following up since it's been awhile. Finally got a few days off of work and a chance to do a little troubleshooting. Did not appear to be a ground or printed circuit issue after all. Had some oddball continuity indications across the the high beam indicator lamp (things like no continuity across the bulb holder even though the bulb tested good, eventually, it was a little odd). Anyway, removed and reseated the bulb holder (with a new bulb anyway) and life is "bright" again . Turn signals working fine on bright or dim as is the brights indicator - even the fuel gauge is working again (I think, won't know for sure til I get some more gas, but it's showing close to empty rather than pegged off the right). Seems an odd thing to cause so many issues, but at the end of the day, that's the only thing that changed. Cleaning all the grounds and even installing additional grounds for testing purposes didn't help the problem. Just wanted to follow up in case anyone else had a similar issue. Thanks again for all that pitched in to help, really appreciate it.

EDIT: And as soon as I began adding gas from a gas can I saw the gauge peg back to far right. These gas gauges sure are finicky... Electrical connection at tank is solid and had good continuity from it to the instrument cluster plug, and showed almost empty, as expected, until I added about 3 drops of gas, then pegged right again - so doesn't seem like a bad sender, which also tested good before install. Well, the sender ain't coming back out, I'll just keep track of my miles til I get a chance to troubleshoot it later (exactly like i did with my first 72 in the 80's.. some things never change). I need to retire just so I can have time to troubleshoot all the gremlins in this truck

Well, spoke too fast, now that the turn signals are working, none of the instrument cluster lights are. Fuse is good, gotta check the rest out when I get another chance to work on it, getting late here. It waited until I tightened the last screw of the re-install to go bad (truth in advertising, I did check the dash lights on the bench, all were good, but couldn't really check them on the truck as I was working in full sunlight, so more fun to go still).