C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

'85 c4 electrical problem

Old Oct 15, 2010 | 10:53 AM
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Default '85 c4 electrical problem

found a 1985 corvette with 10,000 original miles. clean. my aunt loves it and is going to buy it as soon as it comes back from mechanic. the car is all original, been sitting on a carpet in a garage since '03. the speedo, tach, and overdrive light do not light up. just waiting for mechanic to figure it out. anybody experience this before? any suggestions?
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Old Oct 15, 2010 | 10:56 AM
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1984 - 89 use 4 bulbs for the back lighting of the dash lcd panels....perhaps it is time to change the bulbs out.

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Old Oct 15, 2010 | 11:28 AM
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okay, a little more info, everything lights up, just doesnt move, i.e. tach and speedo stay at 0. also when plugged into whatever computer hes using, it reads normal. thanks engle!
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Old Oct 16, 2010 | 12:26 AM
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Tach gets pulses from the distributor and the spedo gets pulses from the sender on the transmission. The first thing to do is see if those pulses exist. if so, then the cluster needs to be sent out for repair.
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Old Oct 16, 2010 | 03:54 AM
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Originally Posted by jfb
Tach gets pulses from the distributor and the spedo gets pulses from the sender on the transmission. The first thing to do is see if those pulses exist. if so, then the cluster needs to be sent out for repair.
It will cost you about $200 to refurbish your dash display unit.
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Old Oct 16, 2010 | 10:39 AM
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thanks guys, cluster is now sent out
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