Forum Discussion

bmw1999m3's avatar
bmw1999m3
Explorer
Mar 15, 2018

Question about electrical box inside project RV

Hello, I have recently purchased a fixer-upper motorhome (major project, basically torn apart inside, had to rebuild everything) and am nearing completion on the electrical stage. It came with a power distribution box with breakers and fuses. Both the 12VDC and 120VAC circuits connect here. I am just wondering... what is the giant transformer for? It's on the bottom in the attached picture. Also there are what look like resistors near it. Can someone explain if this is for the 120v system and how it affects it? Thanks in advance.

14 Replies

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,261 PostsLatest Activity: Jun 08, 2025