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Old 02-28-2022, 04:21 PM   #41
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Make sure the transmission is in neutral. Move it back and forth (forward/reverse) - wiggle it around in neutral while turning the key.

On my boat, you have to turn the keys on the 12 DC panel as well as turn the 12v breakers on -
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Old 02-28-2022, 04:22 PM   #42
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Diodes by their nature are directional.
otherwise they would be called BIODES
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Old 02-28-2022, 05:12 PM   #43
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Someone already mentioned the fuel primer - there should be a bleed valve-lever that you can open, while pumping, to ensure you've got fuel (remember to close the bleeder valve!)

Picture of my DC panel Ign. Switch's/breakers.
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Ign Switch - 12V Breakers .jpg  
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Old 02-28-2022, 05:26 PM   #44
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This is why I always promote a methodical A to B approach for diagnostics. It doesn't matter if the OP's mechanic had started at the injector or the fuel tank. In very short order the mechanic would have discovered fuel on one side of the solenoid and not on the other. At that point it doesn't matter if the solenoid had just been replaced, its the problem, at that point one can then investigate if its electrical, mechanical or improper installation. Jumping from one possibility to the next just sets you up to chase your tail.
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Old 02-28-2022, 06:15 PM   #45
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For those jumping in now, the problem has been solved. The original failure was in a blocking diode for the fuel shutoff. The OP incorrectly installed the replacement, and tail chasing ensued and continues. Itís amazing how many times one can hit themselves in the head with their own hammer.
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Old 03-01-2022, 02:28 AM   #46
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At that point it doesn't matter if the solenoid had just been replaced, its the problem,
But in no way is something we fixed yesterday the problem today.
Remember to fix it until it is broken.
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Old 03-01-2022, 08:00 AM   #47
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Of course a diode is inherently unidirectional. Thatís it whole purpose in life. r.
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Old 03-01-2022, 11:11 AM   #48
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For those jumping in now, the problem has been solved. The original failure was in a blocking diode for the fuel shutoff. The OP incorrectly installed the replacement, and tail chasing ensued and continues. Itís amazing how many times one can hit themselves in the head with their own hammer.
I could see why the diode was ignored as a problem as after first installed correctly the engine ran properly. So despite being installed in the wrong direction it still allowed functioning? Thatís the part that confuses me if I understand it correctly.
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Old 03-01-2022, 11:21 AM   #49
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I could see why the diode was ignored as a problem as after first installed correctly the engine ran properly. So despite being installed in the wrong direction it still allowed functioning? Thatís the part that confuses me if I understand it correctly.
You are assuming that you got just the facts and all of the facts. I highly doubt you got both.
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Old 03-01-2022, 12:14 PM   #50
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I could see why the diode was ignored as a problem as after first installed correctly the engine ran properly. So despite being installed in the wrong direction it still allowed functioning? Thatís the part that confuses me if I understand it correctly.


Thatís not my understanding of what happened, but who can be sure :-(

I understood that after a mechanic diagnosed the bad diode, the OP replaced it and that engine still wouldnít start. So assuming it was a different problem, they went down a bunch of other rabbit holes not realizing that the diode was just installed backwards. But I could have that completely wrongÖ..
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Old 03-01-2022, 12:53 PM   #51
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Thatís not my understanding of what happened, but who can be sure :-(

I understood that after a mechanic diagnosed the bad diode, the OP replaced it and that engine still wouldnít start. So assuming it was a different problem, they went down a bunch of other rabbit holes not realizing that the diode was just installed backwards. But I could have that completely wrongÖ..
I think you may have answered it. If the OP installed it backwards why would it start?
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Old 03-01-2022, 04:58 PM   #52
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I’ve had my two 1982 Cats 3208T’s for six years. Five years ago I looked at a bunch of old relays and diodes that were mounted near the ignition solenoid that were clicking randomly when the key switch was on. They were not causing problems. It just seemed like a place for something to go wrong. It looked too complicated for me. A Cat 3208 is a very simple engine. If power is applied to the solenoid, fuel is in the injectors, air is available, it will start in 1/8 of a revolution. So I took out all the old clicking relays and diodes and rewired the fuel solenoid directly to the key switch. I also rewired the the rest of my boat while I was at it. Ran great. This year I took the boat from Long Island to The Exumas. 1450 miles in 19 days cruising at 17 knots. 1850 gallons of diesel. Ran like kittys. Not one problem. Heading back to NY in May.
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Old 03-04-2022, 11:13 AM   #53
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Engine started and runs fine after a swap of shut-off solenoid.
Now a new power line installed and it does not work again.
Yes it is hard to follow along.
Yup. Forgive the imperfect narration. Business is booming (supply chain headhunter) and so are my distractions.

Yes I now know a diode is unidirectional.

New power line from Cat did not include diode at all so I made two mistakes there. Bad part and bad install.

Yes it then became a rabbit hole fiesta.

Made up my own power lines with diodes and all is good.

Moving on...
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