Hmm. Inside turn signal indicators function differently with headlights on

[jocko]

Originally Posted by Eddie70

Did it all work good before the Tach installation? If so, I would be looking at the tach connections and lights. You could take the tach out and see if all is corrected.

I believe everything was working before the tach was installed. However, the tach operates independent of the new printed circuit, it connects directly to the fuse panel and the coil (and works fine except, like the rest of instrument panel, doesn't light up when the headlight switch is on - which kinda makes sense, if the rest of the instrument panel isn't backlit, the tach would not be either (I think) - because I "think" the inner two (of four) instrument panel backlights are the ones that also light the tach if equipped). But good question and good point, I have considered popping the old instrument panel parts back in w/o tach just out of curiosity - I'm starting to wonder if my instrument panel lights ever worked, I haven't driven it at night in ages. But I know they lit up on the bench when I checked them with a power probe, all of them individually and also by powering the harness connector gray wire. So, something's just not adding up. Could be bad headlight switch, but I usually tend to suspect the things I've changed more than the things I haven't when something goes south... ha.

Originally Posted by 68isgreat

Interested to see the outcome of this also. Problems like this can drive a person nuts.

yep, it's sure drivin me