Accidently arcd a battery, did I fry my trailer?

[doroma]

It's always a good idea to save the connection to the power source as the last step.

[doanshop]

You did no damage to trailer or battery. If you damaged the battery, it would have blown the top off. I just lay a rag over the other terminal keeps that from happing as stated always hook up ground last. And use safety glasses when working with batteries.

[Jeff_W]

I did the same thing last year, wrench across the two battery terminals. Scared the hell out of me. No battery damage and no damage to the trailer wiring.