Hello everyone, I've been researching this particular topic and there seems to be a lot of mixed answers out there. Though I feel dumb having to ask this I always find it's better to be a fool for a day, and not forever. Anyways, I have a mostly 12V system that uses an inverter or generator connected to a transfer switch. Coming from the transfer switch I have a 12V DC transformer that I am wanting to utilize. My question is can I connect the negative DC wire from the transformer to chassis ground? There are multiple batteries going to the chassis ground in this system. Basically what I'm trying to accomplish is when the transfer switch is activated by the generator a signal is sent from the 12v transformer to a control board. The control board uses a chassis ground for grounding. I have read that there could be trouble doing this, I've also read that it's completely acceptable and normal in this type of power system. I'm just looking for a clear answer. Thank you.