Idiot lights all come on, batt is brightest, others go mostly out with high rpm. Alternator putting out 13.5 volts. Cleaned battery grounds, all fuses and fuse holder prongs. Have pulled out instrument panel to check on temperatue compensation board. I do not see one. I have the pictures from Don Foster for an 86. Is there a compensation board on an 84? If so where do I find it? If not, do I need to look for ground points for the instrument panel? Where would these be? Any other ideas?

Sounds like a harness short. Like where the wires are routed under thr crank pulley (big red Alt. output, small red Alt. charge lamp bulb, and black from oil pressure sender.

See how the insulation looks at the 8-pin fire wall connector also.
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Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Now gone)
'83 Turbo 245
'73 142 (98K)
'71 144 (track modified--and still here)
New 144 from '67 to '78
Used '62 122 from '63 to '67

My experience is with an '81 but the warning light circuit may not have changed thru '84. The warning lights are connected to battery voltage on one side and through a diode to the small wire on the alternator on the other side. The individual sensors are connected between their light and each diode. So when either a sensor switch closes and connects to ground or the alternator output is less than battery voltage a light comes on. All this applies to those lights that normally come on when the key is in the run position before starting. I have a diagram I came email if you like. Unfortunately its 80kb so to big to post.