Mercury outboard alarm module replacement It turns out the oil pump is bad and the gear on the crank shaft lost teeth, and only turns the mechanical oil pump erratically which triggers the alarm. If I understand the system correctly, this should render the oil injection system useless but will keep the system whole for any future owner of the boat. I have a 1989 Merc 100 hp outboard and the alarm sounds constantly with the key on or off. Disconnect 1 of them. I installed a new wiring harness and am pretty confident it is wired correctly. › See more product details Repair difficulty: Easy Repair time: Less than 30 mins Repair symptoms: Oil warning/temerature alarm would come on intermittently. I purchased this motor and have never run it yet. I deduced it must be the oil warning module- of course, unplugging this module will cut the alarm no matter what, so I will not know for sure until it is replaced. Refer to your repair manual for proper diagnostic and installation procedures. we have replaced the impeller, oil pump, oil control module and 2 r read more One simple method would be to isolate the warning horn circuit in the engine cowling preferably as close to the cannon-plug connector as possible, and see if you still hear the low-tone horn. "Well, It wasn't the warning module box. we are getting an alarm--constant- beep-beep-beep. Everything functions correctly now. Mark" Below I give some advice on the operation of the Mercury outboard engine WARNING HORN or AURAL ALERT SOUNDER as used on many Mercury outboard engines, particularly c. This would help to determine if the problem is in the keyswitch harness (or on the engine itself). . The sensor, part 9 is normally not replaced, as it does not typically fail. They are pat 9 in the diagram. Also, I cut out the factory 8 pin plug harness and hard wired it together, and that fixed my shorting problem. If it is not, you have a bad oil tank and it will need to be replaced. The tank is part 1. Disable the low oil alarm module by disconnecting the ground wire near the module. The circuit is shown in a pictorial wiring diagram below. I am planning on plugging the oil pump and mixing my gas 50:1, as the replacement of the gear is ~$1,500 - $2,000. Locate the 2 wires that are coming from the bottom of the oil tank. Then turn the key on to see if the alarm is still sounding. Replaces / compatible with Mercury Part Numbers 41470A25 & 41470A26. 2000 and older two-stroke-power-cycle models. Repair story: After troubleshooting and determining that the temperature sender and the low oil switch were good, I replaced the oil warning module. Aftermarket Low Oil Warning Control Module, It Meets of Exceeds All Manufacturer's Specifications. we have a 1995 200hp mercury outboard black max carbureted model(not dfi or efi). Aftermarket Low Oil Warning Control Module, It Meets of Exceeds All Manufacturer's Specifications. ojedxli odn nzxwi eezav goszbmt lkbb lznd ukrebip rqoj iyg