help dasboard light problem

need help ideas on how to troubleshoot dashboard lights problem
my '93 civic instrument lighting in dash board go on and off intermittently but are off more than on and i can not find the trouble is this a common
familiar problem to anyone.
occasionally riding along and they come on then 2-30mins - 2 hours later (random) they will be off, when they are on i can adjust brightness with dash light dimmer switch. i tried wiggling wires, banging dimmer switch, and looking at fuses in fuse box swapping for new one etc and nothing seems to produce the desired Cause/Effect need to diagnose and fix.
any ideas ?
rob
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robm wrote:

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Did somebody change the stereo, or is it original?
'Curly'
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I changed the stereo to a pioneer deh4500 and i used a OEM style honda connector kit to create a plug for stereo wires to match the honda stereo connector
i can't say if the trouble started at or near the time of stereo change but it is possible
is there something i should be looking for to fix ?
robm
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