I'm wondering if I'm having problems with grounding up front. About a year ago I went through and cleaned all the grounds I could find at the rear of the van (in the engine compartment and underneath). Now I'd like to find and clean up grounds in the front. 

Symptoms I'm seeing are:
Front heater blower works intermittently. Sometimes a bang on the dash turns it on.
Headlights still poor after relay upgrade (haven't replaced bulbs yet)
Here's a weird one; digital clock only displays if engine RPMs are over 1200

I know there are the "stars" behind and to the left of the fuse block as I did the headlight relay upgrade. Do these tend to need cleaned up? Do they even come off? Are there additional ground points that I need to look for under the dash? Hopefully it won't involve pulling the dash.

Mark K
1986 GL/2WD/4SPD