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Now in 993 land ...
Join Date: Mar 2003
Location: L.A.-> SF Bay Area
Posts: 14,891
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You are over-analyzing this. There is no diode in there as mreid already told us.
For bench testing you can hook up 85 and 86 to 12 V either way and test resistance across 30 and 87.
The magnetic field created in the relay to pull the switch closed can be either polarity, as it is pulling in a ferromagnetic switch that is "equal opportunity" - attracted to either polarity magnetic field.
G
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