Hi Dred,
I don't actually. This is sort of out of my "lane". No experience with the 150.
But I'm thinking it might be something simple like a blown or missing fuse or a poor electrical connection. If you had to unplug any of those one wire bullet style connectors during the project, double check that you got them reconnected with their matching color coded wire. Those can be easily "crossed up".
I would be suspicious about the "adapter cable" too since so many parts are just not made well these days.
Sorry I can't be of more help but, hopefully, someone here has done this and knows what to look for.
Good luck.