It's okay, since then I've wired in resistors to the wiring and that did the trick
My local exhaust garage have quoted me £130 to do the exhaust bypass, but said they couldn't fit electronic valves cheaply to it because of the space they'd be working with, so I was quoted a four figure price with electronic valves which is ridiculous. Thinking of possibly giving them two ball valves that I could just open and close by hand? Would that work?