Thanks Bob, your help has been invaluable. I am thinking that since the belts on both seats lock/unlock simultaneously, logically the problem must occur at a connection somehow common to both.

One more quick question, if the controller unit itself is defective, would that not cause the roll bar dashboard and/or switch warning lights to activate, or cause the roll bar itself to misfunction? I ask only because the roll bar itself seems to operate fine and no warning lights are present. I'm afraid to ask what a new unit would cost...

And if I do need to wire an alternate ground, is there a switched circuit back at the roll bar controller?

Thanks again!

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1999 SL500