My dad's 350sdl is having an odd issue with the power accessories. On occasion, the radio, wipers, power windows - basically all power accessories- just turn off and then back on after a few moments. Today, they didn't come on at all.

My dad says that when he has jiggled the key in the past, it seems to correct the issue, but this could just be a coincidence.

The other issue is that the glowplug warning light behaves oddly. It doesn't always come on when the car is glowing, and it comes on after running for a minute or two and then stays on. This might just be a bad glowplug, which is frustrating because I replaced them with Bosch ones about 2,000 miles ago.

Has anyone had this issue before? I am trying to decide if this could be an issue with the glowplug relay being bad and creating a big power draw, or if it's an ignition switch issue. I tried to swap the glowplug relay with a spare I had here, but I forgot that the 91's have afterglow and the older models don't, so I was unable to swap them out.