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ContinuousWave: Small Boat Electrical
Bad Battery Wiring Stops Motor
|Author||Topic: Bad Battery Wiring Stops Motor|
posted 01-07-2008 09:04 AM ET (US)
I have a 115-HP OMC outboard motor. Not sure the year. The boat will run fine then all of a sudden just stop. It stops like the switch has been shut off and the power has been turned off. I have an idea it's due to some of the wiring to the battery because if I move the terminals the motor will start. Do these motors require power from the motor to run all the time?
posted 01-07-2008 10:05 AM ET (US)
Sound like you have a problem somewhere within your wiring harness.
There are two cables that lead into your motor. One is a battery cable that simply runs from the battery to the motor and connects to the starter solenoid. The other is the wiring harness which runs from the motor to the dashboard and has connections for the tachometer, key switch, the lanyard activated kill switch and trim/tilt switch. If your motor is shutting off like someone turned the key, I would check the connections at your key switch and the connections to the lanyard kill switch. Also, pull the big red connector at the motor apart and take a look at the internals of the connectors, both sides, to make sure the connections are clean and then reconnect.
Also, make sure that the battery cable is secured to the battery with regular hex nuts and locking washers, not wing nuts.
posted 01-07-2008 05:57 PM ET (US)
THANKS I'LL TRY THAT AND LET YOU KNOW
posted 01-08-2008 07:39 AM ET (US)
I went home and worked for a few hours on the wiring I can't get the motor to fire off at all now I pulled a plug and grounded it to the block and got no fire to it at all I put new terminal ends on the wires that looked bad and the thing still won't do anything IS IT TIME TO GIVE UP?
posted 01-08-2008 08:02 AM ET (US)
Does your 115 have the motor mounted trim switch on the port or starboard side of the motor?
Do you have the gauge or the tach that has 4 red lights that turn on then off when you first turn the key to ON?
This will help narrow down the type and year of your motor. Of course, telling us the model number would be the biggest help.
posted 01-08-2008 08:29 AM ET (US)
The trim/tilt switch is on the shifter. I've been informed by the guy that GAVE me the boat that the motor is an 1984. I hope this will help.
posted 01-08-2008 09:22 AM ET (US)
Your outboard motor is a spark-ignition motor, and it needs electrical energy to create the spark. The motor generates its own electrical energy for the spark. It should maintain spark even if the battery becomes disconnected.
If the motor cranks over with the electric starter, that's a good indication that the wiring to the battery is making a good connection. If there is no spark during cranking, the problem is likely not related to the battery connection.
If you want to perform service on your motor, I recommend getting the service manual. In the service manual there will be a long diagnostic process which will help you isolate which component is causing a loss of spark.
posted 01-08-2008 04:32 PM ET (US)
If you get the model number (will begin with E (Evinrude) or
J (Johnson)), we can figure out the model year.
Get the factory service manual, not an aftermarket manual.
posted 01-09-2008 07:45 AM ET (US)
Thanks Chuck for the info. I still have not been able to get the motor to fire off. I know for a fact that it does run. I guess I'll be taking it to someone more boat motor friendly. Also, the mod. # is 893610
posted 01-09-2008 08:57 AM ET (US)
That sounds like the serial number, not the model number.
Model number will begin with E or J (assuming it's a 1980 or later motor),
and if it's really an '83 it will have a CT as probably the
the third or fourth characters.
posted 01-13-2008 09:31 PM ET (US)
Not sure but wont the engine run with the battery disconnected if the alternator, can produce enought electric to fire the plugs?, I would check your alternator. Place a new battery on the engine with short cables, if the engine starts and runs disconnect the battery if it still runs it was your old battery or cables, if the engine quits I would check the alternator...good luck
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