I try to connect my A518 OD activating by means of switch

LOBOROJO said

I finally understood, many, many thanks for your help. :)

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I have questions! I’m doing this exact same setup. So, to make sure I’m following, 12v+ to one side of the OD plug, and a “switched” ground to the other side?

Safety switch center pin was 12v+ (in my case from my push button) and the pin closest to the front continues on to my starter, and the rear pin is to my reverse lights?