Mercury 175 ProXS
SN 1B537766
Year 2008
running 23 pitch Tempest @ 5800-6,000 rpm
Running along and immediately went to 5100-5200 rpm, them a little later went back to 5800-6000.
Then went back to 5200 and never “kicked” back in. The last time the engine acted like this the merc mechanic found dead coil.
My question is do you clip the red on timing light on positive on starting battery and the neg of light onto coil wire going to the plug? The mechanic told me how to check it myself but I have forgotten with the light hooked up. I think Don Weed mentioned this once but I didn’t find it.
Thanks guys/folks ahead of time.