Warning light coming on at idle; goes off when revved. 2008 SANTE 220 343 EXC

[jkallen21]

The codemate works on all MEFI-4 compatible boats. They sell various adapters. This table looks like yours is a MEFI-4 but PCM/Nautique can probably tell you for certain: https://www.rinda.com/acro/Engine_Support_2023.pdf

[billywro]

Considering myself lucky today... issue was corrected by replacing the Water Temp Sender (# R020019). It's not often that the easiest to access and cheapest of the potential fixes turns out to be the fix. Thanks again to all for your interest and help!

[srock]

Of note the gauge and idiot lights typically have separate sending units so when a light comes the first glance should be the gauges as a confirmation. I will also comment on your battery age note. Electrical issues related to batteries, alternators, and loose wires can create the strangest symptoms that are easily resolved.

[Scooter G]

Thanks for the follow through on your fix billywro, good job man, glad you nailed it!
And under $20 bucks, that never happens...