3Ym30 won't turn over

[tbert]

I turned the key on my 06 Hunter 33 with Yanmar 3YM30, there was no sound but the lights on the engine control panel dimmed. The battery was fully charged. I set the batteries to both and tried again with no luck. This has happened twice now. In both cases it started after a few tries and checking the engine compartment, touching wires etc.. I checked the voltage at the starter and it was reading 13+ volts.

I believe that only the engine control panel dims, none of the other electrics on the boat seem affected.

Anyone had this happen?

tbert
'06 Hunter 33

 

[onecoolair]

Sounds like another defective yanmar wiring harness. The quick Fix... Run a continuous new white properly sized monmentary wire (I used a #10) next to harness and connect to same location as white wire on starter seloinod.
You may also want to replace the key switch with new solid brass marine/automotive 25 dollar key switch from the local o'reallys auto part store. No more having to contort your finger to get to that damn button! :cussing:While tracing out the harness run I would find all the "hidden" plug connectors and clean and carfully tighten up all the pin connections. Filling each pin with some dielectric grease. I also added a cut off selector switch plus a heavy duty 30amp rated push button switch in engine compartment.
No more leaving battery connected full time to starter. Plus I now have a backup emergency start option.

I turned the key on my 06 Hunter 33 with Yanmar 3YM30, there was no sound but the lights on the engine control panel dimmed. The battery was fully charged. I set the batteries to both and tried again with no luck. This has happened twice now. In both cases it started after a few tries and checking the engine compartment, touching wires etc.. I checked the voltage at the starter and it was reading 13+ volts.

I believe that only the engine control panel dims, none of the other electrics on the boat seem affected.

Anyone had this happen?

tbert
'06 Hunter 33

 

[tbert]

Thanks for the info Robert. I will start with the wiring and connectors.

 

[Jake N Eggs]

Tony,

Maybe you moved the wiring and caused a bad connection when you were in there removing the nuts for the jib sheet turning block. Is the problem new since you did that repair?

 

[badsanta]

Just because it shows proper voltage does not mean the amps are there to work it. Most likley corrosion or loose connection. Trace wire and check connections. Search yanmar starting problems also.

 

[tbert]

Tony,

Maybe you moved the wiring and caused a bad connection when you were in there removing the nuts for the jib sheet turning block. Is the problem new since you did that repair?

I had the same issue before I fixed the turmning block leak. The night of the full moon sail it did the same thing. I traced the white wire from the ignition switch to the starter. There is a flimsy connection to the starter which I cleaned and tightened.

 

[tbert]

Just because it shows proper voltage does not mean the amps are there to work it. Most likley corrosion or loose connection. Trace wire and check connections. Search yanmar starting problems also.

I am slowly checking and cleaning all connections. There was evidence of salt water corrosion on the engine when I bought the boat. The surveyor thinks that a hose or pump broke and sprayed. I have already had the alternator rebuilt, one of the windings was corroded right through.

 

[onecoolair]

I am slowly checking and cleaning all connections. There was evidence of salt water corrosion on the engine when I bought the boat. The surveyor thinks that a hose or pump broke and sprayed. I have already had the alternator rebuilt, one of the windings was corroded right through.[/quot

Cleaning the connections is only a temporary fix. To make it more permenant and reliable you will need to run a larger "continuious" white marine grade wire for your momentary starting wire along side the harness. I did this and have had no more issuies. Left the existing white momentary wire connected.
Testing the contacts seemed always okay. But if you loaded it up thats when it would fail. The connections would just not allow for the right amount of amp draw. Plus I believe the wires could be sized up a notch. Over time this can burn up your starter or selonoid. Thats if it doesn't put you up on the rocks first!
Every one I know has had this problem with the yanmar wiring harness defect. This has been going on for years....Remember the cool Jaguars back in the day. Yanmar must be using the same company to make their wiring harnesses.

 

[MSN-Travelers]

Under sized wiring ...

I am slowly checking and cleaning all connections. There was evidence of salt water corrosion on the engine when I bought the boat. The surveyor thinks that a hose or pump broke and sprayed. I have already had the alternator rebuilt, one of the windings was corroded right through.

Doesn't matter what boat it is in, Yanmar supplied the wiring harness to the boat builder along with the diesel.

Let me be the third voice telling you that the white wire that runs from the push-button switch to the starter solenoid was marginally adequate when new. This thin wire has to carry enough current to energize the starter solenoid and hold it shut as the starter turns.

There are couple ways to fix this problem but the least expensive, and easiest to accomplish, is run a replacement wire (at least 10 ga) from the button to the starter solenoid.