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I have a 1985 70hp Johnson outboard as soon as turn the switch…

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I have a 1985 70hp...
I have a 1985 70hp Johnson outboard as soon as turn the switch on i get an alarm before even trying to start the engine what do i look for... Read full answer
I have a 1985 70hp Johnson outboard as soon as turn the switch on i get an alarm before even trying to start the engine what do i look for
Submitted: 7 years ago.Category: Boat
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Answered in 3 minutes by:
6/14/2012
Marine Mechanic: Jason, Marine Mechanic replied 7 years ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 19,700
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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My name is XXXXX XXXXX I will be helping you today. Most questions will involve troubleshooting, and usually take many posts back and forth. Post back with questions as needed.

.

There are only 2 things that will set the alarm off on that engine. There is a temperature overheat switch in the cylinder head. And an oil level sensor in the remote tank.

Simply disconnect them 1 at a time and whichever one silences the alarm is the problem.

.

Feel free to post back with any questions.

Good luck and happy boating!

Jason

Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 19,700
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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Marine Mechanic: Jason, Marine Mechanic replied 7 years ago

Just to add 1 more thing here.

Your original engine had what they called a VRO fuel pump. There are no sensors in the basic VRO pump. However, newer engines have what they call an OMS/VRO pump. The OMS pump does have an oil flow sensor in it. If the fuel pump is not original to the engine, you woud want to check to see if somebody stuck an OMS pump on there at some point and tied it into the alarm.

Other than that, disconnecting each of the sensors 1 at a time until the alarm silences will tell you which sensor is bad. Now in the event you disconnect all the sensors and you still get the alarm. Then you have either a bad alarm buzzer or there is a short circuit someplace.

.

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