test high temp alarm?

[couger300]

i was wondering if there was any way to test the temp alarm on my 1996 johnson 90hp? there was water in the oil tank that i didnt know about. anyways i was thinking that if no oil was going to the engine it would prob overheat. there is a beep when i turn the key but i would really like to test the system. thanks

 

[Haffiman]

Re: test high temp alarm?

The 'official' way is to heat up the switch and measure for continuity at the set temp.
Another 'unofficial' is to put the key on, then heat up the head (be careful) and with an IR gun monitor when the alarm goes off.(Switch reacts on head temp and not water temp)
Testing the NO-Oil in VRO, use a separate fuel tank with fuel-oil mix (2%), take the oil hose off the vro and start the engine.

 

[couger300]

Re: test high temp alarm?

i read to on this site somewhere to ground the tan wire. which i did and no alarm went off.

 

[Haffiman]

Re: test high temp alarm?

You have to ground the Tan wire in harness end, not the switch wire. This will tell you that the harness and horn is working, but not if the switch itself is working. Remember key ON.

 

[couger300]

Re: test high temp alarm?

that is what i did. i got nothing!

 

[emdsapmgr]

Re: test high temp alarm?

Possible you have a bad horn. Does it beep once every time the keyswitch is turned to the on position?

 

[clanton]

Re: test high temp alarm?

Engine needs to be running for alarm horn to sound, when grounding tan overheat wire. The overheat light on tach should come on, with engine not running.

 

[Haffiman]

Re: test high temp alarm?

Engine needs to be running for alarm horn to sound, when grounding tan overheat wire. The overheat light on tach should come on, with engine not running.

For the No-Oil (VRO), yes, but not the overheat.