batteries

my rv is having trouble starting….?

I went to start my motorhome and it acted like the battery was almost fully dead. The interior lights worked but the headlights did not. I was even able to easily start the generator. After about 20 minutes messing around with the auxillary start button, it started. Left it running for a half hour and then drove it for 20 minutes to my storage. when i got there, i shut it off,,,waited 5 minutes…then tried to start it. No luck. I think its the solenoid but not sure.
Also, before it started the battery gauge said about 3 volts. just before it started, the gauge jumped to about 10 volts.
Any info would be great

Corroded battery cable connections.

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