David, YES !!!!! Most of the coaches of my era had that setup by PMMI for the reverse polarity indicator.
I thought I had read about the PMMI issue many years ago on the Bluebird forum.
I tried to contact PMMI but never got a call back.
Could you email me the info richard.entrekinATalconlabs.com?
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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