Re: VRO instructions
If you are going from 3 wire to 4 wire, you need only find a switched purple wire to connect the pump purple wire to. The 3 wire only had a tan wire, black wire, and a gray wire. The three wire pump alarm supplied power from gray tach wire. The 4 wire supplied power from tach and switched purple. The 4 wire pump has black, gray, tan, and purple. You didnt say which engine, so I cant tell you where the switched purple wire is on the engine.