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Well all that said it sounds like this sensor just needs a steady 12V to operate. It's not sensing anything off the 12V line so I say go ahead and add protection for the sensor. A 12V/5W zener in parallel with something like a 100uf/400V capacitor across the sensors +/- terminals and maybe a 47ohm/10W resistor in series. Check voltage at the sensor after installation since I'm spitballing the added resistor. It may be a tad low of 12V but I'l bet it would work alright and help extend the life of the sensor. This circuit could be pakaged in a shrink tube and tucked away pretty easily I think. But it's your BBQ.
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"Take two placebos, works twice as well." Enzo
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You would have to decouple it from the ACC line, which should be coming straight off the rectifier. Although it is called 12V, it is fluctuating between 12 and 14V, so it should not be clamped directly. Unless in these modern bikes the ACC circuit is already decoupled from the charging circuit and regulated.
The battery acts as a big capacitor, so it should kill any big spikes.
Originally posted by Enzo
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