2014 Mercury 90 FOURSTOKE No Start

Repair or modification of Boston Whaler boats, their engines, trailers, and gear
pflinally
Posts: 1
Joined: Sat Oct 16, 2021 6:28 pm

2014 Mercury 90 FOURSTOKE No Start

Postby pflinally » Sat Oct 16, 2021 6:35 pm

[My 2014 Mercury 90-HP FOURSTROKE engine] stopped suddenly with [a diagnostic] message [that said] something like "Voltage Problem."

[Now when the ignition switch is move to RUN from OFF with the battery switch set to] A, or to B, or to BOTH, nothing turns on.

I am certain that both battery A and B are good.

Before the breakdown, the batteries were NOT charging in neutral but were charging in gear with typical increase in voltage upon more power and this as observed on a Voltmeter.

[Give] advice [on the cause].

jimh
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Joined: Fri Oct 09, 2015 12:25 pm
Location: Michigan, Lower Peninsula
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Re: 2014 Mercury 90 FOURSTOKE No Start

Postby jimh » Sun Oct 17, 2021 9:34 am

To assess electrical problems you must have a reliable and accurate voltmeter, and possess knowledge on how to measure electrical voltages. If you have both those, then:

Remove the engine cowling.

Using a reliable voltmeter, measure the voltage at the engine on the terminal post to which the primary positive conductor from the battery switch is connected.

Report the voltage read on the voltmeter

jimh
Posts: 9638
Joined: Fri Oct 09, 2015 12:25 pm
Location: Michigan, Lower Peninsula
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Re: 2014 Mercury 90 FOURSTOKE No Start

Postby jimh » Sun Oct 17, 2021 9:35 am

pflinally wrote:[My 2014 Mercury 90-HP FOURSTROKE engine] stopped suddenly with [a diagnostic] message [that said] something like "Voltage Problem."


I don't understand how you could have read the diagnostic message if after this event there was no electrical power being provided to any device on the boat, as your narrative describes.

How were you able to read the diagnostic message if nothing was able to operate from battery power?