Here is a photo of three starter solenoids. They all pretty much look alike, but there is a big difference in the one on the right. The two on the left are outboard marine starter solenoids. The one on the right is for automotive application. If you try and use that one for your outboard, it will cause damage to your wiring system. The difference is in the internal wiring, and grounding. In the marine units the body and bracket is electrically isolated. On the automotive unit the ground is thru the bracket.
Attached is the photo and copies of the schematic showing the internal wiring (Seloc manual)
Hope that this clears up any confusion… and saves a motor.
Joe B
