A: trailer wiring kit, how to?

First get a different mechanic. You use your brake light plug. you can find this under the carpet by the back left side.

A: !998 Caravan 3.3.service engine soon light on,what does it m?

My service engine soon light stayed on and I had to reset your computer chip. I had to do this two times before it stayed off.

A: which freon is used to charge the a/c??

134A is the freon you should use.