So here's the scoup:

I replaced the Headlamp switch with a new one, & I also replaced the Wacky-tach with a new old stock one. Enerything works fine until I turn the headlights on. After a few minutes all of the gauges except the speedo freak out & peg all the way up or down. Also- the right turn signal indicator illuminates. If I twist the dimmer I can get partial recovery, but nothing works right until after I turn the headlamp switch off. Then everything works again.


WTF?

 

So uh...., bump.

No quick fixes for this one huh?

 

If all functioned correctly before the switch install, then reason would suggest that's the place to start.

JamesC

 

This problem is the reason I replaced the headlamp switch in the first place. I thought it was a problem with the dimmer reastat(sp?) because when the dash would crash I could get partial recovery by twisting the dimmer. If I turn the dimmer all the way down I get almost total recovery. When I turn the headlamp switch completely off the cluster recovers completely.

Since replacing the headlamp switch the only improvement is smoother dimming. The pre-existing problem with the dash is the same as before.

Here's one thing for thought: The brighter the dimmer setting, the more out-of-whack the gauges are???

 

I have no experience with your particular problem, but perhaps the following will be helpful:

http://92b4crs.tripod.com/86wiring/dia-pics/117-0.jpga

Here's the entire link to the above:

http://92b4crs.tripod.com/86wiring/86wiringindex.html

Here's yet another link:

http://www.austinthirdgen.org/index.php?pid=19

JamesC