Help! I changed the impeller and on my last two times out I got an alarm at idle, once in gear alarm went off for remander of the day. can anyone explain?

replace the water pressure sensor,,common problem with the 496..

Do you know how much the sensor cost

from bam 102.00


# 10 in rhw pic

http://www.mercruiserparts.com/Show_...=SEAWATER+PUMP

Should I trouble shoot it first before buying one? Maybe disconnect it to se if thats the alarm or not?

Just bit the bullet and buy it. I spent half of last summer dealing with the same issue. Turns out I had a few grains of sand plugging up my water pressure sensor. It is an easy fix. It is located on your Impeller Housing.

Thats a $100 bullet buys alot of Beer

Have it scanned by a mechanics or buy the Rinda scan tool. It's worth it.

newer 496,s have the water pressure in the power steering cooler,,,very easy to get to,,,http://www.mercruiserparts.com/Show_...Power+Steering part #29

Not trying to come across as a D1(k, but $100 is not that much when dealing with these types of boats. Granted $100 does buy a lot of beer, but it will also get rid of that pesky alarm you are dealing with. To me, that sounds like $100 well spent.... How much is your time worth? Figure you spend 4 hours (here and there) screwing with it trying to troubleshoot.... That $100, equates to $25.00 an hour........ Me, I'd rather spend that 4 hours on the water drinking the beer........