alarm coming on

i have a 84 johnson 150 gt v6. i can take it down the lake and the alarm starts to come on. the slower i go most of the time it goes ( beep----beep---- beep) the faster i am going the alarm stays on constantly. after the alarm stays on constantly, if i am going at a higher speed, the motor shuts down. but soon as the motor shuts off, the motor will crank right back up, there is no smoke coming from motor when this happens! i do not have to wait for motor ro cool down before starting it back. the water pump was replaced last feburary. i mix the gas and oil, since there is no oil tank on it. last time i took the boat out, the alarm was coming on even at 10 mph, sometimes it comes on around 30 - 50 mph. so it occurs at different speeds?
can anyone help with this problem.
thank you

Re: alarm coming on

The normal warning horn sounds are as follows..... however, since you are mixing your fuel/oil, I assume that you have converted from the automatic oiling system back to the premix setup and if so, I suspect that you have not disconnected the wiring as required. I have also included that procedure below. Let us know if this corrects your problem.

(VRO Horn Warnings)
(J. Reeves)

NOTE: I retired around 1991/92. Possibly some of the later V4 engines and others may also incorporate a fuel vacuum switch that would enable a fuel restriction warning to sound as mentioned below, an unknown factor to myself.

1 - A steady constant beep = Overheating - The V/6 engines, possibly some others, have a fuel restriction warning which is also a steady constant beep.

2 - A beep every 20 or 40 seconds = oil level has dropped to 1/4 tank. (Late model engine = Every 40 seconds)

3 - A beep every other second = VRO failure, air leak in oil line, oil restriction, (anything that would result in a lack of oil being supplied to the engine).

NOTE - If the warning horn is the black plastic (overpriced) three wire type horn, the warning horn should beep once when the ignition key is turned to the ON position. If it does not, it is either faulty or someone has disconnected it (a stupid move!). At any rate, if it does not beep which indicates that the horn is non functional, find out why and do not run the engine until the problem is corrected.

(VRO Pump Conversion To Straight Fuel Pump)
(J. Reeves)

You can convert the VRO pump into a straight fuel pump, eliminating the oil tank and VRO pump warning system, but retain the overheat warning setup (and fuel restriction warning if so equipped) by doing the following:

1 - Cut and plug the oil line at the engine so that the oil side of the VRO pump will not draw air into its system. Trace the wires from the back of the VRO to its rubber plug (electrical plug) and disconnect it.

2 - Trace the two wires from the oil tank to the engine, disconnect those two wires, then remove them and the oil tank.

3 - Mix the 50/1 oil in the proper amount with whatever quantity fuel you have. Disconnect the fuel line at the engine. Pump the fuel primer bulb until fuel exits that hose with the tint of whatever oil you used. Reconnect the fuel hose.

That's it. If you want to test the heat warning system to ease your mind, have the key in the on position, then ground out the tan heat sensor wire that you'll find protruding from the cylinder head. The warning horn should sound off.