650 3Cyl Bad tilt switch, trigger or switch box.

pwpeterson

Cadet
Joined
Jun 27, 2005
Messages
16
Hello, I am having some problems with my 650 3 Cyl merc (ser 3661133 )<br />I followed some test others have recommeded and here are the results I have as I write this.<br /><br />The current voltage status of the switch box connections are as follows:<br /> <br />Key switched off:<br />Red wire: 12.7 volts<br />All others: 0 volts.<br /> <br />Key switched on:<br />Red wire: 12.7 volts<br />White wire: 12.7 volts<br />Brown wire: 0 volts<br />Blk/Wht wire: 3 volts<br /> <br />If I disconnect the mercury tilt switch the Blk/Wht wire goes up 12.7 volts. If I turn the engine over the Blk/Wht wire drops to 10.7 volts<br /> <br />Would anyone have an idea what the problem is?<br /><br />pwp
 

timmathis

Lieutenant
Joined
Apr 24, 2005
Messages
1,295
Re: 650 3Cyl Bad tilt switch, trigger or switch box.

My boat done like this and it was my trigger!
 

timmathis

Lieutenant
Joined
Apr 24, 2005
Messages
1,295
Re: 650 3Cyl Bad tilt switch, trigger or switch box.

You may need to test trigger.
 

pwpeterson

Cadet
Joined
Jun 27, 2005
Messages
16
Re: 650 3Cyl Bad tilt switch, trigger or switch box.

Testing the trigger/switch box<br /><br />The next time the engine does not start, <br /><br />1. Take a DC voltmeter and check the voltage on the White terminal of the switch box(12V from the key-switch). You should have at least 9-1/2 volts at cranking. Low voltage, check the wiring, battery and key-switch <br /><br />2. Take a DC voltmeter and check the voltage on the Red terminal of the switch box(12V from the battery). You should have at least 9-1/2 volts at cranking. Low voltage, check the wiring and battery.<br /><br />3. Take a DC voltmeter and check the voltage on the White/Black terminal of the switch box (12V through the switchbox to the trigger). You should have at least 9 volts at cranking. If the voltage is ok above and low here, replace the switchbox.<br /><br />4. Disconnect the White/Black, Blue and Black trigger leads.<br /><br />5. Connect a jumper wire from the White/Black to the Blue wire.<br /><br />6. Connect another jumper wire to the Black wire.<br /><br />7. Bring # 1 cylinder to approximately TDC (Top Dead Center).<br /><br />8. Connect a spark gap tester to the # 1 spark plug wire.<br /><br />9. Turn the key-switch to the on position.<br /><br />10. Tap the jumper wire you connected to the Black wire against engine ground. You should get a spark each time you do this. If you get fire, the trigger is likely bad.
 
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