Re: solenoid
Upon starting an electric motor is a dead short. When it starts turning the current flow is reduced. This switch sees the full battery current upon contact. Because it is 6 or 12 volts there will not be a very big arc but there is one and it corrodes the contacts. I suppose if a coil could go weak it would make for a bad connection resulting in corrosion. If you do not have an infrared thermometer they are worth the investment. Any poor electrical connection will show up as heat. It may only be a few degrees difference but that is an indicator to a problem. Under normal conditions no switch or cable should get hot. The solenoid cable will produce a little heat but that is all.
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