Nothing worse than a dead machine that has to go out on a job just because the lights where left on !
Like our HDXD heavy haulers .
Using Relays can be confusing .
Looking for a low amp circuit to activate relay (it's just an electric switch )not going into crazy detail but I'll show you what I did to make lights shut off with the ignition switch.
My plan off attack . Basically pull 15 amp light fuse . Cut the wire in back (green on 2015 model ) use a 12 gauge wire and attach it to panel side splice to #30 on relay, take to other spliced wire (circuit side )run to #87 on relay . Then splice into white 14gauge wire and run same gauge wire to #86 , #85 goes to ground . Done . Wow that was easy . By doing this you just cut off the power to light circuit that can only turn on by the white wire that's keyed to ignition . Basically you turn key on and white wire magnetizes the coil pulling the points together to activate the "switch" to power lighting circuit as per usual except it shuts lights off when key is off now .
A few pics ., green wire ( light circuit )
Mounted relay on this rail like the other OEM ones .
Cut and and strip green wire
I solder my wires and shrink wrap where I can . Personal favorite way . Never fails so far
attaching wire to #30 terminal, green one above it is going to #87
splice into this wire off panel . Small gauge wire most likely low amps . Relay barely takes any amps to activate electric switch .
oops !! I said splice in and solider .
Turned out great.
A little video
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HDXD top dresser mix of LEDS and OEM lights . Using 2 relays .Lighting was ok before except for the fact that lights did not shut of when ignition switch was off. Also when I added the big LED on front it started blowing the 15 amp fuse .
Left relay same as above post .The Right I went from a direct battery hook up and installed a 15amp inline fuse that went to #30 on relay. The red wire on the amp sucking LED wires to #87.black on LED lights went to ground . #86 went of the exact same spiced white wire . ( both relays are (take very little power to activate coils on relay ) ) now take #85 wire and run to your on/off switch and of the other side of switch just run to ground . In this hook up the switch activates the circuit exciting the coil pulling points closed to activate battery power to LED . Easy
A few pics . Amp sucking LED causing the fuse to blow in light circuit before
Ground for light switch.
Label them for later reference.
Another Vid .
A relay is just to circuits in a box . One turns the other on . The other is the power circuit . You can have power fed switches or negative . Depending where your switch is your switch circuit could be live activated by a switch on the power side lol . now your confused . Follow the above instructions you'll be fine
