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Old 09-02-2015, 02:33 AM   #1
Lt. JG
 
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Exclamation HELP! 2100 SD won't start (oil light comes on)

OK, it's been a while since I've been on here. There are lots of good discussions, but none that relate to my specific problem. (that I can find) So, here goes; my 2100 SD (that I LOVE!) finally let me down for the first time. We boated all night, and shut the engine off to enjoy the evening and the sunset. When we went to leave, the push button start sequence works as usual until it is time for the starter to do it's thing. The console beeps, and the "stop" light and oil light both illuminate. I checked my oil and it was fine. I checked my out-drive oil, and it was low. I know why it was low - because i recently replaced my lower unit and only refilled my out-drive from the bottom oil port. I completely forgot there was an upper reservoir. I filled the reservoir and still will not start. I verified that the switch in the reservoir is functioning correctly. Is there a master re-set for the control panel? I cannot find my owners manual as we have recently moved.
Any help would be most appreciated!!
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Old 09-02-2015, 03:16 AM   #2
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Does you hear any sounds such as a click (soleniod)?
Check batter voltage when trying to start it to ensure the battery is good.
Check battery connections foe corresion or being loose.

If these do not fix it post back with finding and we'll go from there.
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Old 09-02-2015, 10:27 AM   #3
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Batteries are good. Connections are good. Fuel pump primes is about the only noise that seems to happen when I hit start. There is some sort of safety lock program that seems to think my oil is low or something. It is either not re-setting, or a sensor is telling it that something is not good. It can't be the oil pressure sensor, because the motor hasn't even started yet, how could it be expecting oil pressure?
Thank you so much for the help!
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Old 09-02-2015, 12:31 PM   #4
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What engine do you have? Do you see the engine breaker (red button) on top of the engine? Next to it should be a slave solenoid, try jumping across the 2 large terminals with a screwdriver. This should make the engine crank. Post back.

PS can you post some pictures of the engine?
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Old 09-02-2015, 12:52 PM   #5
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Default 5.0 Merc

It has the 5.0 Merc V-8
Hopefully my phone can post these pictures. I just noticed that a code seems to pop up on the LCD display at the helm. 3.1 I believe.
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Old 09-02-2015, 12:56 PM   #6
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Default Pics won't go

I'll have to wait until after work to post pictures. In one of my other threads (about the membrane switches) there are pictures of the helm and boat.
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Old 09-02-2015, 04:34 PM   #7
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silly question but it's in neutral right?
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Old 09-02-2015, 07:51 PM   #8
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Yep, definitely in neutral.
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Old 09-03-2015, 12:30 AM   #9
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Ok, here are some pictures. I tricked the thing into starting by hitting the start button and (using the much safer method of jumper cables outside of the engine compartment) jumping the solenoid at the same time. It ran perfectly, but the stop light was still on. Also, after a brief ops check of all systems, I shut it down and tried to restart it correctly. Same problem. It would seem that whatever the error code 3.1 is that shows up when I hit the start button is what the hang-up is. It's like it is not recognizing that I filled the outdrive oil reservoir. I also checked the outdrive oil level at the vent plug and it is also full.
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File Type: jpg DSC_3270.jpg (141.6 KB, 7 views)
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Old 09-03-2015, 12:45 AM   #10
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To my knowledge low lube will not prevent the engine from starting.

Have you googled the error code for mercruiser?

What soleniod did you jump, the slave or the one on the starter?
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