When I turn on my headlights, both my turn signal indicators along with my high beam indicator are glowing, and the temperature meter shoots up to the top, when I know the temperature hasn't changed. This started out as an intermittent problem, but now it is like that all the time I have my headlights on. Nothing else seems to be amiss, but it's a pain not to see my speedo at night or to have an accurate temperature reading. The temperature meter works just fine when the headlights are off.

As some have suggested on this board, the other lights coming on suggests a ground problem, so I cleaned up the headlamp ground points in the engine compartment. I also took out the temperature compensating board, cleaned up the terminals, and reinstalled it. Neither of these ideas fixed the problem.

What should I check next? Should I replace the headlamp relay? Is it possible that my temperature compensating board is bad and is causing these problems, but only when the headlights are on?

I've got a multitester, but I'm not too bright about how to use it to find a weird problem like this. Where do I go from here?