Weird brake turn signal issue

[Torquewrench]

My blinkers used to work great. But I had battery issues on a crappy rainy night and got lazy and let a shop tow it in and put in a new battery and cables.

Picked it up today and was surprised my turn signals didn't work. Headlights and taillights work fine, but when I put the brakes on, even with the key off, both blinker bulbs come on.

I bought gas on the way home, and I think the gas gauge didn't move as much as it should have.

For the life of me I can't imgine what would have changed after just putting cables on and a new battery. Would a dead blinker relay cause symptons like this.