Eh? I know that 30/40 is power, 87 is ground and not sure exactly what to do with 85 & 86...
Also, what exactly is the purpose/value of the relay...
Also, what exactly is the purpose/value of the relay...
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How to wire a relay for HID headlights..
- Thread starter nsxotic911
- Start date
What are you trying to do? Most HIDs are Plug & Play to the factory headlight plugs.
May also consider just buying this, as it's already made and it's plug and play as well. This allows you to draw your power directly from the battery (relay is built int) and it only uses the stock wiring for the On/Off switch signal.
http://www.ddmtuning.com/Products/HID-Kit-Wiring-Harness
May also consider just buying this, as it's already made and it's plug and play as well. This allows you to draw your power directly from the battery (relay is built int) and it only uses the stock wiring for the On/Off switch signal.
http://www.ddmtuning.com/Products/HID-Kit-Wiring-Harness
Probably easier to do what Hapa says but if you want to learn...a relay is always typically a good idea for high current draw devices (5amps or over).
A relay is needed for high amperage electrical devices. A relay is a switched device that takes the electric load away from the switch and displaces that electrical load onto the relay itself.
Here is the wiring diagram for a typical 5 prong 30amp relay.
When wiring a relay you need to ask yourself two things.
1. Is your circuit normally open or normally closed?
2. Is your circuit positive trigger or negative trigger?
Relays can be used to do some trick things but typically for your application it'll be something like this.
86 & 85 are your triggers that energizes the coil which flips the "pole" between 87a (normally closed) or 87 (normally open). This will come from switched +/- signal from your NSX headlight wiring harness. I haven't seen a standard that says neither 86 or 85 need to be positive or negative.. they just need to be either for the trigger.
87 is usually your source (aka. Battery + or - Ground)
30 goes to the headlight depending if you're doing negative trigger or positive trigger.
87a cap this off.. you don't need it.
A relay is needed for high amperage electrical devices. A relay is a switched device that takes the electric load away from the switch and displaces that electrical load onto the relay itself.
Here is the wiring diagram for a typical 5 prong 30amp relay.
When wiring a relay you need to ask yourself two things.
1. Is your circuit normally open or normally closed?
2. Is your circuit positive trigger or negative trigger?
Relays can be used to do some trick things but typically for your application it'll be something like this.
86 & 85 are your triggers that energizes the coil which flips the "pole" between 87a (normally closed) or 87 (normally open). This will come from switched +/- signal from your NSX headlight wiring harness. I haven't seen a standard that says neither 86 or 85 need to be positive or negative.. they just need to be either for the trigger.
87 is usually your source (aka. Battery + or - Ground)
30 goes to the headlight depending if you're doing negative trigger or positive trigger.
87a cap this off.. you don't need it.
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The relay handles the high current load of the head lamps. The switch to trigger the relay is typically a very low current capacity switch. Otherwise you would need a large bulky switch. Think 1966 Mustang.... The head lamp switch pulled to turn on the lights. Big and bulky. (no relay) This is the origin of cars allowing to you to leave the head lamps on when the car shut off. Today many cars control the low current headlamp switches with the ignition switch or are auto on / auto off. (control lines small/ low current, headlamp load lines large / high current)
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What are you trying to do? Most HIDs are Plug & Play to the factory headlight plugs.
May also consider just buying this, as it's already made and it's plug and play as well. This allows you to draw your power directly from the battery (relay is built int) and it only uses the stock wiring for the On/Off switch signal.
http://www.ddmtuning.com/Products/HID-Kit-Wiring-Harness
Thanks!!!!
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..Is a Farad basically a large version of a relay? I know, dumb question 
. Still figuring out all the electronic stuff..
. Still figuring out all the electronic stuff..
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I recently installed a McCulloch HID kit on my 1997 and what we did was tap into the ground wire and lo-beam power wire on the factory harness.
We used this DIY for some guidance
http://www.nsxprime.com/FAQ/DIY/hid_install.htm
We used this DIY for some guidance
http://www.nsxprime.com/FAQ/DIY/hid_install.htm
The existing headlamps have the proper relays. If you use the existing headlamp socket you are automatically using the relays. Your job is done for you.:wink:
Been running HIDs off of the stock harness for 3 and a half years now.
..Is a Farad basically a large version of a relay? I know, dumb question
A Farad is a unit of measure for capacitance (capacitors). "A capacitor (formerly known as condenser) is a passive two-terminal electrical component used to store energy in an electric field."
It is different from an electrical relay which is more of an electrical switch. Relay's can have capacitors in them (where the size of the capacitor is measured in Farads).
Large 1+ Farad capacitors are used to store energy.. in automotive, they are used for large stereo systems to provide power continuity when large energy draws occur (like when super loud bass hits in a booming stereo). It'll prevent lights from dimming and volume levels from dropping.
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