yanmar harness | eBay www›Search›yanmar harnessYanmar 3GM30(F) Wiring Harness 2gm20(F) Pre-Owned. $89. Buy It Now +$4 shipping. Yanmar Engine Harness Part # CE42510 . Brand New. $105. or Best Offer Yanmar Harness, Wire 3 127610-77710 See more like this. Yanmar First Station Wiring Harness Extension 6 Meters CE40420 . Brand New. $125. Buy It Now Yanmar 3GM30 wiring - Gear Anarchy - Sailing Anarchy Forums Dec 04, 2007I need to find a source of switched +12V at the engine (Yanmar 3GM30 circa 2000). The panel is several metres away from the engine but I need the switched b+ at the engine itself. I have the wiring diagram but I can't see anything that looks like switched 12v coming through the harness.