Just a suggestion.
When you install batteries, or even just check for clean connections, use some deoxidizer grease at those connections, like on the solenoid you just installed.
The deoxidizer grease is made for electrical connections, I use it always, saves head aches later.
At my young age, lol...
You could still maybe see me rolling down the highway, on my motorcycle, pulling a trailer with camp gear, smiling, beard in braids...
Feeling The Wind! (FTW)