dash lights don't work wiht headlights?

[ricematthews]

Mitchell:
If I'm not mistaken, there are several bulbs in the dash and it's unlikely
that they all went out at the same time - therefore unless you had a gradual
dimming (i.e. individual bulbs going out one at a time), I wouldn't suspect
the bulbs.  And I don't think that the dash lights are relayed (actually, I
don't think that the headlights in my 4kq are relayed at all), so I wouldn't
suspect a relay.  And the lack of a headlight relay would make me suspect
the switch - too much current passes through the switch causing it to heat
up and eventually fail.  Just my .02
-Mark

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I've got the same problem on my 88 90Q.  I just drive without them.  BTW...I
replaced both lic. plate lamps, so I know it's either the switch (not
likely), the bulb in the dash (I hope), or a relay.  Are there any other
bulbs in the circuit that could be causing this?