I just stumbled across these while researching something else.
Recently there have been some reference to how to protect switch circuits connected to relays. Here are two papers done by Tyco which have been corroborated by certain others and are consistent with Eric Jones' recommended use of Snapjacks (bi-directional zener diodes).
Some methods (not recommended here) of protecting the switch contact result in extending the opening time of the relay, which causes arcing, bouncing and degeneration of the relay contacts. (not a good thing for maximizing starter current).
If you are going to do something in this department, I highly recommend reading these. (or just use EV100 relays and be done with it)
Colyn
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