If you have a switch or an alarm or keyless entry that has a negative output that you wish to use to switch a device that requires 12v such as a horn dome light parking lights head lights hatch release etc wire a relay as shown below to convert the negative output trigger to a positive output. Convert a negative output to a positive output relay wiring diagram.
E43 Spotlight Wiring Diagram Negative Switching Wiring Library
Negative switched spotlight wiring diagram. Lay out the wiring in the engine bay making sure the deutsch plugs can reach the location of your lights the terminals can reach the battery and the switch can penetrate through the firewall. A far easier method is to always wire the trigger for your relay across the high beam bulb circuit instead of from 12v to ground. The diagram below shows a simple wiring diagram for connecting spotlights to work together with your high beams. There are several other benefits to wiring in this manner. If your test. Assortment of 12v relay wiring diagram spotlights.
It shows the parts of the circuit as simplified forms and the power and also signal links between the gadgets. All you need is some wire and lugs a 12v 4 pole relay and two fuse holders with the correct fuses. It a basic headlight wiring up grade and you dont need to know whether the vehicle is positive or negative switched the wiring sorts it out automatically. Connect the negative wire to the negative terminal of the battery. This means that regardless of the vehicle wiring positive or negative switched the driving light wiring is the same. One thing i would change is the cable between the battery and the fuse block this should be at least 6mm to give the best results.
Ground your test lampmeter somewhere on the body or the batterys negative terminal and switch the high beam on. Take the in line fuse out of the wiring harness. A wiring diagram is a streamlined conventional pictorial depiction of an electrical circuit.
Gallery of Negative Switched Spotlight Wiring Diagram
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