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Hi Craig, my name is Jason.
On the cylinder heads you will see a tan wire. This is for the temp sensors. Disconnect them and let me know if the alarm still goes off or not.
Your going to have to get the engines scanned for codes, this isn't something I will be able to help you with.
Hello, my name is ***** ***** tech here on the site. I will assist you with these.
Your solid horn could mean a few ither things besides just overheat. Start with testing the batteries to see what the voltage is on them. Any higher than 15, there is an issue with the charging system If it is lower than 9.5, it will not start the engine. Start with this check and let me know.
I am only online in the eve, CST in the USA weekdays, and most all day on the weekends.
Sounds good, please keep me informed.
The stbd engine is normal codes that come up without SmartCraft gauges.
The port looks to have a failed stbd head sensor.
I am unable to open that link. Can you verify it?
Yes, that was me. I tackle most of the harder questions on Mercs
Looking at your coils. Can you read the numbers that are embossed into them?
There are 6 coils on the engine, one for each cylinder. They are located on the rear of the engine, black in color with a single grat plug wire coming from it and a 5 wire plug-in on it as well.
No worries. There are no time limits here.
On the engine that gave you the horn, inspect the temp senders on the cylinder heads. Make sure that there are no melted wires from the sensor to the main harness. 14, and 42 are the two types of temp senders.
Are you using just one battery or two?
Are all the posts clean and tight?
Before ordering the sensors, I would check to make sure that there is nothing melted in the harness anywhere.
On the engines, not in the boat.
When was the last water pumps installed?
Lest move some parts between the engines and see if the problem follows. Start with the Stbd cylinder head sensor. swap from the port to the Stbd engine. Turn the key on ans see if the Stbd engine now has the horn and not the port. If still the same, move the port head sensor and repeat.