Im posting this for a friend of mine. His craft is a 1999 Chaparral Sunesta with a Mercruiser EFI 5.0 and Alpha Drive. The issue is a constant warning alarm that sounds as soon as you turn on the key. The boat starts and runs fine and gets full rpm on the water. I come to understand that there are 3 things that trigger this alarm: 1. Low oil pressure, but that should kill power to the fuel pump and the boat runs at 50 psi now. 2. Over temp that should put it limp home mode and limit rpms to 2500. It has a new impeller in the out drive and runs @175 degress which is pretty text book for the EFI and it's not limited on the rpm. 3. Low oil level in the out drive resevour. It's full and the float switch moves. I am leaning toward a bad switch on # 3 since the alarm sounds as soon as you turn the key on and never stops. Is there something that we may be missing?? Thanks..
