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Suddenly Lost All Power

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BigBen1285

New member
Hi everyone, I have a 2007 cobalt 252 and yesterday was cruising at about 70% throttle in relatively calm water, and all of a sudden everything turned off and the engine shut down. As if I turned the key to off.

Bilge and blower still worked. Couldn't find any loose connections at the helm, ground bar in engine bay was good, safety switch in the on position. Got towed in, trailered it home, just checked it tonight and when I turn the key to ACC everything is fine. Obviously a loose connection somewhere, or is the ignition going bad?

What else should I check?
 
There is no Red reset button on this Boat so,
I am guessing the engine ECM shut down and reset it's self.
If not then check the Ignition fuses, relays and engine electrical harness is plugged in well into the ECM.
 
Check the wiring from the fuse box to the ignition switch:
B terminal, red wire, gets 12v with battery switch on
I terminal, purple wire, gets 12v when you turn key to ignition on
S terminal, yellow/red wire, gets 12v when you turn key to start
The gauges should be powered off the I terminal of the ignition switch
 
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