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Have a 115hp 2005 model, the engine cranks fine at the

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Have a Johnson 115hp...

Have a Johnson 115hp 2005 model, the engine cranks fine at the control box & will sometimes fire & start on 1 battery - normally needs 2 batteries to start. If unplug engine loom from motor that goes to control box & plug a key switch directly into the engine wiring loom motor has spark & will start every time even on 1 battery. W ehave replaced CDI unit, stator, optical sensor, starter relay, pinned out all connections etc. Ina nutshell we are running out of ideas

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Is there anything else the Marine Mechanic should be aware of?

Nothing that I can think of, we have even tried different wiring loom & control box & battery direct to motor

Submitted: 9 months ago.Category: Boat
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Answered in 7 hours by:
9/21/2017
Marine Mechanic: Jason, Marine Mechanic replied 9 months ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 17,484
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Good morning, my name is ***** ***** am I speaking with? I read what you wrote. Can I start by getting the model number on the engine as it reads on the ID tag.

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Customer reply replied 9 months ago
Model is J115PLSOR, serial #;(###) ###-####
Marine Mechanic: Jason, Marine Mechanic replied 9 months ago

Okay got it. When go to start it, can you measure the voltage on the yellow with a red stripe wire that runs to the optical sensor and see what the voltage reads while cranking?

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