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GlennLever's avatar
GlennLever
Explorer
Nov 18, 2014

Help / Stranded / RV will not start /Road Service is no help

Help We pulled into the RV park here last night. Connected to shore, had heavy rain. Disconnected this morning and went to leave and the engine will not crank Turn the key, dash lights up,...
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cbr46's avatar
cbr46
Explorer
Nov 25, 2014
When a magnetic field collapses, like when de-energizing a relay or coil, it puts a large spiking voltage back into the circuit. This can be orders of magnitude greater than the supply voltage. Putting a diode backwards across the coil shorts out this "back-EMF". Not sure if that's the intent here, but a possible reason.

Best,
- bob

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