After reading this thread I realized the GP light in my 87 was only staying on for 2-3 sec no matter how cold it got. I tested the relay with the purple wire pulled and it stayed on for 38 seconds. I swapped a spare 87 relay and sure enough the light was on much longer. After taking the bad relay apart I found a couple of bad capacitors. I'll replace those, clean the contact on the relay and report back. Its good to have a spare.

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CENSORED due to not family friendly words