Alternator belt needs to be very tight on these. If yours slips when electrical load is applied, see if you can solve the problem by tightening the belt. Helps to use a crowbar for leverage but be careful not to place the crowbar against any fragile parts.
Also, check the condition of the belt itself.
If the belt is slipping, the gauge will read lower because the alternator is not able to meet the electrical demand.
If tightening the belt does not help (should at least stop the squealing), then start looking at possible failing heater fan or resistor pack, and wiring issues.
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1985 744 gle d24t
1985 745 gle d24t
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