There is no way another $1200 is coming by the end of this month.The trickle charger is much less expensive than paying to find out what's wrong. The basic diagnostic test is $75 then charges are added after that for as long as it takes to run the electrical diagnosis. The mechanic said it could take hours. I am retired and on a fixed income. I don't have that kind of money to spend for hours of diagnosis. I know you are right and if I was still working I would do this.
The ball joints on my truck need to be replaced because one is 'wiggly' and both have to be replaced at the same time. Plus, it's $100 for the alignment. One of the shocks is leaking.
I read that Americans are supposed to be receiving another $1200 by the end of this month and if we do, I will use that money to have the things done on my truck that need it.
Hope things work out ok for you. Let us know how the rear wiper thing goes, if you do that.