Your initial thoughts may be correct. If I had a picture of the guts of this thing with the top and bottom pics of the control box, (I think, Morgan back then was using their own black box with an imbedded Balboa Instruments control system, along with their own heater), then I can show you exactly where to check.
You'll need a simple VOM meter, available at home depot or radio shack. Nothing expensive.... a small cheap one will do just fine.
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If you have the ability to upload a digital camera picture, then do that also. If it's too large in size, you can email any pics to
image91@spanet.net
Thanks.