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Temperature alarm switch

Venom

Member
Hi all, I have Merc 4.3LX 1995 in a Searay 195 BR
Does anybody know at what temperature the alarm switch should close, (go to ground) I want to test it using a kettle and meter for pease of mind following a major engine overhaul and partial rewire. The alarm works fine when the wire is grounded but I don't know at what temperature it should operate or if indeed it actually works.
 
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