I recently purchased a 1985 Sylvan with an '85 Evinrude 90 hp E90TLCOS which I have discovered (thru preventive testing of the heat and oil level sensors) had previously had the warning buzzer removed. I suspected the reason it had been removed was due to a problem in the circuit somewhere so I called the previous owner to see what he could tell me. He said he never had any problems with the buzzer and didn't know it had been disconnected. He owned the boat since 2001 without any issues with the overheating or VRO. I went to Ebay and found a two wire buzzer cheep and today got it wired to my control box. As I suspected, when the key is in the "on" position I get a constant tone. I disabled the overheat sensors and the low oil sensor one at a time and I still get a constant tone when the key is ON. SO. . apparently I must have a short somewhere in that circuit? Electric diagnostics is not my strong suit. I do have a 'multimeter' and I checked for continuity between the tan wires to the main looms large red connector at the engine and all was good.
The wiring within the control box for the buzzer had two purple wires on a crimped on 'slip' connector and the tan wire had a similar connector. The buzzer I bought only had two wires, the purple and the tan with a blue stripe. No ground wire. It did have a mounting bracket molded into its casing that could possibly act as a ground but I ran the wires outside the control box and do not have the buzzer attached by that bracket. I know this buzzer isn't the identical part # but from what I have read on the topic it will still work.
I received my motor shop manual set and have studied the wiring schematic but . . .? Any ideas what I might want to check next?
The wiring within the control box for the buzzer had two purple wires on a crimped on 'slip' connector and the tan wire had a similar connector. The buzzer I bought only had two wires, the purple and the tan with a blue stripe. No ground wire. It did have a mounting bracket molded into its casing that could possibly act as a ground but I ran the wires outside the control box and do not have the buzzer attached by that bracket. I know this buzzer isn't the identical part # but from what I have read on the topic it will still work.
I received my motor shop manual set and have studied the wiring schematic but . . .? Any ideas what I might want to check next?