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Yamaha F150 slow/fails to crank

Old 07-27-2019, 01:14 PM
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Y&R
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Default Yamaha F150 slow/fails to crank

I could use some help diagnosing what I believe is a starter issue with my Yamaha '07 F150. It has trouble turning over and often fails to start on a single battery. Occasionally I can get the engine to start with a single battery but seems to be rare. When the battery switch is turned to "All" the engine will start but it struggles. I cleaned all the contacts at the battery, battery switch, and engine terminals but that didn't seem to help. I purchased a multimeter and ran some tests but not sure where I need to go from here. Also can anyone tell me what the red wire terminal on the starter solenoid connects to and the brown wire on the starter solenoid connects to and their purpose? I'm guessing the red is the ignition but not sure what the brown is.

Each battery reads 12.5v with no loss at the switch

Under load each battery is reading 10v

Meter reads 12.4v at solenoid starter battery lead to ground and 10v under load
When battery switch turned to "All" reading 11.5v

0v at solenoid starter brown lead to ground and 8v under load

12.5v starter solenoid red lead to ground and 7v under load


Any help would be much appreciated.

Old 07-27-2019, 01:28 PM
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Remove the ground wire at the engine block and make sure it is clean, lightly sand the contact surface and retighten.
Old 07-27-2019, 01:56 PM
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i tried that but no luck
Old 07-27-2019, 02:13 PM
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Dropping to 10v at the battery terminals suggests that the batteries are old or the starter is pulling a lot of current. How old are the batts and are they fully charged?
where exactly did you measure the 7v at the solenoid? On the lead to the starter?
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Old 07-27-2019, 02:32 PM
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If dropping voltage at the battery under a load , id say the battery is weak.
Old 07-27-2019, 02:42 PM
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Had an issue on the same motor. Battery cable from the motor was corroded inside the insulation and you couldn't see it. It was a little past the rigging tube. Kept checking for voltage drop until i found where it was bad. It was the factory rigging wires from Yamaha.
Old 07-27-2019, 02:46 PM
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Originally Posted by Y&R View Post

Meter reads 12.4v at solenoid starter battery lead to ground and 10v under load
...
12.5v starter solenoid red lead to ground and 7v under load
I'm not following the difference between those two, but whatever -
7 volts at the starter is not going to spin the motor well -
not provide the ECM, plugs and injectors properly

As already stated, you have either a weak battery or 'bad' cables/connections.

Get the batteries load tested,
if the CA results is OK,
use your multimeter to find and quantify the voltage drop.
Voltage Drop Testing

The solenoid is a remote controlled switch - turned on by an electro-magnet.
There is another smaller remote controlled switch - the starting relay.

The idea is, you need to turn the starter motor on and off,
but you don't want to send all that power up to the key switch and back.

So when you turn the key to start,
the key switch sends power back to the the engine to the starting relay

The starting relay then closes, providing power to that large brown wire
the brown wire then energizes the magnet of the starter solenoid,
which closes to connect the big red battery cable to the starter motor itself.
Old 07-27-2019, 05:34 PM
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There’s a smaller red cable (not the large red positive cable) connected to the underside of the solenoid starter. I wasn’t sure what this cable was for but that’s what was reading 7v under load.
Old 07-28-2019, 06:58 AM
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Bad batteries? Have them tested
Old 07-28-2019, 07:02 AM
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Is there a 1/2 to 1 second delay when you turn the key to START and when the starter motor begins to engage the flywheel?
Old 07-28-2019, 10:06 AM
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Batteries and battery switch are new.

Not sure about a delay. Doesn’t seem to be longer than what I would expect.

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