followme21
Seaman
- Joined
- May 19, 2008
- Messages
- 65
So my Mercruiser Alpha 1 trim gauge has been pegged to the full up position for some time now.. I have tested the gauge and when I jump from "ground" to the "S" terminal (brown with white tracer) the gauge bounces around and goes full down, I assume that means the gauge is working??? I have power on the "I" terminal on the back of the gauge as well (with switch on). I replaced the sending unit, but before I pulled the outdrive and did it "the right way" I hooked it up and ran the wires on the outside to to make sure it would work correctly, they were long enough and hooked right up.... Anyway nothing changed, gauge still pegged full.. I then grounded the gauge again, this time back on the block as it comes out of the wiring harness and plugged in to the sender. (brown with white tracer). gauge still went to pegged down. I tested the other wire back there and it has no power.. should that be hot? is that the "I" wire? It is black back there on the wiring harness, but purple coming out of the gauge?? any thoughts as to what to look at next? Thanks. (I have also replaced the gauge, with a different one and still same results).
Last edited: