Unfortunately, even as recently as the early '90's models, I have never seen a wiring diagram. I have had some of the 'old hands' at Newell pull a little 2x4' booklet out of their pocket where they had made some notes of various parts of the wiring for various older coaches.
I suspect you have a relay in front of the drivers seat and another in the rear, likely outside compartment near the taillights. If you find the rear relay, jump 12 volts to the trigger lead on it and it that works, it is likely the relay in the front. If it doesn't work, then you a bad relay in the rear.
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