Raymarine Ev tiller low battery alarm

[Sardean]

Was the spark small or a big crackle

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[northoceanbeach]

So the only real culprits would be the big red cables at the 1-2 or at the batteries?

[Sardean]

Have you got power going again

Lets just focus on getting power back on from when you cleaned terminals


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[northoceanbeach]

Just a couple small sparks

[Sardean]

Fuses should be ok

After you have checked battery wiring against photo and reconnected loose wiring . If you still have no power turn 1,2, both switch to both ,then with meter read voltage from the two smaller red wires that are joined together ( main switchboard feed ) and connect to + busbar , and the negative busbar

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[northoceanbeach]

I'm focused on getting power back on. I just don't know what it could be. I checked online fuses, they are fine. The big red cables that go to the 1-2 switch are tight, the red wire that comes from the back of the 1-2 switch to the back of the circuit breaker is tight.

What else can I check?

[northoceanbeach]

Well, the sparking actually did blow a tiny fuse that goes to my solar, although I don't know why, the solar is unattached since I am at the dock.

[Sardean]

Check voltage in panel from + busbar to - busbar with switch in both position

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[northoceanbeach]

We have power! There was a black fat cable coming from the engine that I must have unattached to clean and now I just reattached it! Yay! Boy am I stupid. What next?

[Sardean]

Awsome

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[Sardean]

That gives a clue as to voltage drop problems because that wire should only be in play for engine starting.
Check that the big black wire connected to bar in swichboard goes directly to battery

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[Sardean]

You said you found a disconnected wire was that the one to motor or is it something else

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[northoceanbeach]

The big black wire was a fat battery cable and it goes from battery number two, the starter battery and bolts into the side of my engine.

I don't know if this is random or not, but I have everything turned on again, and instead of the VHF shutting itself off when I push the talk button it dims the interior lights and then says low battery.

[Sardean]

This is a guess . As would need more info to be 100%. Run a heavy wire from - busbar to negative on battery this should fix all problems, except electronics dropping on start up (may fix it but if not can be fixed later). If you dont have heavy wire run 4 (min) to 6( more than adequate ) of the 12awg wires , tape the bundle together every 6 inches to make life easy. twist the ends together and put in crimp or solder lug. If you dont have this then just strip them 1inch long twist together ond wrap around a bolt under a washer or other lug.

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[Sardean]

That is great news I am now 100% sure you are missing a haevy -ve wire from busbar to negative on battery

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