250 sho electrical issue

[tuck 1]

Have a 250 sho on 2020 skeeter and when you try to start it knocks all lights and everything out. After maybe 30 secs everything comes back on but will not turn over. The battery is 100% charged . Any ideas? Could it be a fuse maybe?

[mercuryxri]

Check your battery connections that they are clean and tight. The cables from the engine should go on first to the battery followed by the accessories wires and then the charger wires. Most importantly clean and tight.

[champ223]

Could be a loose connection but the battery could be bad also. A bad battery can still show 100% charge but when it’s put under load it could be a different story. Try it with a jumper on it and see if it cranks or have the battery load tested. Could have a bad cell

[walnutshoe]

Check the connections on the engine side. Especially the main ground connection.

[Gsmith223]

What battery and how many graphs do you have powered on?

[tuck 1]

What battery and how many graphs do you have powered on?

It is a deka 31 agm and have all graphs, 360 and livescope on a dedicated battery. Had the battery tested today at two different places and both said it is good. It will start when you when you put the shut off on all but not on one which is normal use

[Lowerider58]

I’d check cable that goes from starter battery to switch or switch may have bad contact in the switch . If you can take the wire going to motor and hook it directly to the battery I’ll bet it starts. If it does switch is bad.
Hope this makes sense.

[billnorman1]

Sometimes on a marine battery the threaded connection breaks loose under the cover. It is unusual, but it happens. Battery testers use the two posts that are lead coated to test so this issue doesn't show up.
WHat you are describing sounds like loose or corroded cable to battery connections or a bad master switch if so equipped.

[tuck 1]

Going to check master switch when I get off work this evening and go from there. Thanks for all the suggestions.