I just replaced my 1985 6.9l glow plugs with ac 60g plugs and wired up a manual button for them. I've got power from switch to relay, then power from the switch wire to the 2 Orange harness wires on the glow plug harness. But I'm very positive the plugs are not coming on. Two of the plugs I was unable to change due to my banks turbo being mounted on the back, so I left those connections undone from the plugs(rear two driver side), would that be my issue, or is it something to do with harness? I really need these plugs to work before it gets too cold. Ether works but I'd rather not use it. Thanks guys.