Boating - Recent Questions, Troubleshooting & Support
2006 Tohatsu(Nissan) 4 stroke 15hp, Model MFS15B2. Needing the specified ohm range for both the primary and secondary winding in the ignition coil.
It does seem like an ignition problem.
I don't have specs for your motor, but generally Resistance type HT (spark plug ) leads should show up to 10K ohms or less so infinity means a gap somewhere .
Primary side of the coil can be as low as 0.5 ohms and up to 100 ohms.
Make or buy a spark gap tester. Be careful not to hold the wires or tester. You would know that this is high voltage, but others reading this may not on first try.
Cranking the engine with spark plugs removed keep the tester away from the spark plug holes and any fuel. The spark should jump 5/16th" or more.
If it's only one spark that is weak then it's most likely the plug coil, but to be sure swap it with another to check to see if the weak spark goes with it, otherwise it's most likely a CDI unit. If all sparks are weak then it could be the CDI charge coil or the CDI unit. You would need to find the output specs for the charge coil to confirm which is the problem. Often they put out 150 to 200 volts AC at cranking speed
I hope that helps
2 days ago
Speed box does not show any speed reading when moving
You don't say what kind of speed box you have, but you probably have a "cupped wheel" speed sensor. These need to spin freely with the motion of the water to send a speed signal to your "speed box", but they are easily fouled by corrosion, marine organisms, sea grass or any other sort of debris. Check the sensor for fouling and clean as necessary. Other than that, you may have an electrical problem which is difficult to isolate without test instruments.
on Jan 16, 2019
Am in the process of installing a raymarine dragonfly 7 pro and need to know which wire to connect the hot wire to
The hot wire (positive) is red and the ground (negative) is black or, sometimes, brown. There is also a drain wire in the harness, that should be connected to the RF ground of the boat or, if none, to the negative terminal. You'll also need to add a 3A slow-blow fuse in the positive wire.
Follow the installation instructions as follows:
1. Connect the transducer / power connector to the rear of the unit and secure using the locking collar.
2. The drain wire should be connected to the vessel RF ground point. If your vessel has no groundpoint connect to the negative side of the vessel's power supply.
3. The Negative wire must be connected to the negative side of the 12 V dc power supply.
4. A fuse holder (not supplied) MUST be fitted to the positive wire using a suitably rated inline fuse or breaker.
5. The positive wire must be connected to the positive side of the 12 V dc power supply.
on Jan 16, 2019
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