Overheat Buzzer

[DjKoKo]

Probably real simple. I just installed a used '85 VRO 150 Johnson V6. The motor has NOT even been run yet. When I turn the key ON (not to the full starting position but just ON) the Overheat Alarm stays on. I know it's not overheating. I hasn't ran yet. Easy fix?????

 

[River's Revenge]

Re: Overheat Buzzer

Not sure what we are talking about for the boat... but think of it this way. The alarm is energized saying "I'm overheating" but the engine is off.
Sounds like switching the two wires on the sensor would be an option. or check to see if those wires are touching at the sensor. sometimes they get bent over. If all wires look good and everything looks normal, it could be a bad sensor or dirty sensor. Take the leads off the sensor and try it again. If the alarm goes away then its the sensor. Some can be taken apart.... but if it's a 20 to 30 dollar item to help save the engine if a true overheat condition occurs... well i'd just buy a new sensor.

 

[DjKoKo]

Re: Overheat Buzzer

Thanks
I'm reading something about fuel restrictions doing this too?? Everything looks to be hooked up OK. Once again this motor has not been ran yet on this boat the fuel lines are empty to the fuel/water separators. If that is the problem then I'm not going to worry about it yet. I need to replace the fuel/water separator system before I run it. I just turn the key on to make sure everything was OK there and my wiring is OK.

1985 Johnson GT150 VRO (J150STLCOS) V6

NOTE: VRO is not hooked up and its sensor is unplugged as well.

 

[River's Revenge]

Re: Overheat Buzzer

There is another web site that has been helpful. sterndrives dot com. Look at "why is my engine overheating" it brings up other ideas as to what to check.

 

[metriccrescentwrench]

Re: Overheat Buzzer

If you're '85 V6 is like my '90 V6 there's a vacuum switch that's T'd into the fuel line at the fuel pump. It actuates if there's an excessive amount of suction, indicating a restriction in the fuel system. That's only going to happen with the engine running, so in your case that's not causing the alarm.

The temperature sensors act as switches, they close (turn on) when the temperature is too high and connect the tan wire from the horn to ground. Disconnect the tan wire from the temperature switches, if the problem goes away you've got a bad temperature switch.

Also, if that tan wire is shorted to ground anywhere you'll get an alarm.

 

[DjKoKo]

Re: Overheat Buzzer

Well, I unhooked BOTH temperature sensors and it's still squealing away. Any other suggestions?

 

[DjKoKo]

Re: Overheat Buzzer

OK. Here's what I tried. I hooked the Alarm positive cable to the battery directly. I then unplugged the power cable running from the remote (red plug) at the motor. I touch the tan wire to the Negative cable from the alarm.......Alarm sounds. Does this mean there is a short in that tan wire in the remote cable somewhere??