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Regarding spikes on DC motors, I'm currently in the process of building a couple of instrumented wing pods (to be hung on the bomb racks of our T-33) that have custom made air pumps, run at 24VDC, and during testing, found that not only there was a 13A spike upon start up (settled to 5A while running), but there was a spike of close to 90A upon shut off across the coil. We swapped the relays out for a similar milspect type with diodes (both silicon and Zener types) across the coil, that cancelled out the cut off spike. Might be a handy thing for the PTW (as well as sealing the circuit board to prevent the common failure from moisture.)
Not sure if this is related, but diodes across the coils of switches of any type are very beneficial.
Lol, just noticed this thread is fucking old! Oh well, since it's very informative, is good to resurface once in a while to make it easier for those that actually search, to find it.
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