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Old 18 February 2017, 20:23   #1
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Yamaha ME420sti electrics help!

Guys,

While working on the boat today, I noticed the main power feed from the battery has corroded off the block.

Now the problem is, the connector is under the motor on the port side so I have no visibility!

There is the main line from the battery and 2 other loose cables.

I don't suppose anyone out there has a photo of the underside of this block or any pointers as you where and how these cables reconnect it would be great.

Working from feel is proving a little difficult!

Thanks

George
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Old 18 February 2017, 20:46   #2
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Looks at the parts manual, it looks like the lead is coming off the starter, does any know if this the point where the rest of the harness loops into.
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Old 18 February 2017, 21:14   #3
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If it's anything like my Yanmar 6LP based on the same block, the main positive lead goes to the back of the starter on the port side, and and the main negative earth to a bolt somewhere just under the intercooler on the port side, above the starter. The rest of the main engine harness connects elsewhere, on mine mainly at the back on the port side I think with a number of connector blocks. I guess it depends on your exact battery setup, split charge and alternator wiring as to what the other 2 loose cables could be.
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Old 18 February 2017, 22:12   #4
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Yeh the power lead goes to the starter motor solenoid terminal which is pretty much underneath the starter beware if your working by feel as there is another terminal on the solenoid which is the power feed from solenoid to starter make sure you don't connect to that one
The starter is held on by two bolts which are fairly easy to access it may be easier to remove it and see what's going on and also free off the terminal nut which is often siezed
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Old 18 February 2017, 22:14   #5
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Thanks, starter off looks like a good option.

I'll get on that tomorrow and report back!

Sorry for all the questions!! Hopefully I'll be able to return the favour some day
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Old 22 February 2017, 08:38   #6
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Quote:
Originally Posted by georgeirl View Post
Guys,

While working on the boat today, I noticed the main power feed from the battery has corroded off the block.

Now the problem is, the connector is under the motor on the port side so I have no visibility!

There is the main line from the battery and 2 other loose cables.

I don't suppose anyone out there has a photo of the underside of this block or any pointers as you where and how these cables reconnect it would be great.

Working from feel is proving a little difficult!

Thanks

George
If you're talking about the positive feed then all three of those cables should be on the same terminal which as previously mentioned is on the starter motor. An iPhone on video mode with the flash on is really handy for this sort of thing! The motor is very easy to remove - again you can't really see the two bolts very easily but they are easy enough to feel and then pop a socket onto. The starter should then just wiggle free once you've removed them.
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Old 22 February 2017, 20:45   #7
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To give an update on this, the live terminal on the starter corroded off, so the 3 wires where loose. It also explained why it I couldn't figure out what was going on without seeing it!

Starter out, reconditioned, wires recrimped and ready to be put back together. I was hoping to get it back in tonight, but the rain beat me!!

Tomorrow, if it's dry!
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