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One other thing to suspect is the wire harness going under the timing belt cover. The '86 was in the years of the biodegradable wire insulation so there can be miscellaneous shorts in the harness.
There's a multi pin connector on the firewall with four wires x 2. One goes to the small (red??) wire terminal on back of alternator, around 2 o'clock. That's the exciter wire. If the harness under the t-belt is damaged you can run a dedicated wire from the firewall connector along the fender and to the alternator. Just make darn sure you have the right wire.
Another possibility is the voltage regulator assembly. Inserted in back of alt, held in by a couple screws. Can be replaced with alt still in car, cost about $30. Look in the FAQ here, it probably gives the details you need. Easier and lower cost than complete alternator replacement.
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Sven: '89 245 NA, 951 ECU, expanded air dam to 7" from ground, forward belly pan reaches oem belly pan, open-front airbox, E-fan, 205/65-15's, IPD sways, E-Codes, amber front corner reflectors, quad horns, tach, small clock. Wifemobile '89 245 NA stock.
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