Westfield Daylight Running Light (DRL) wiring.

[DanM]

I am building a Westfield Miata and using the donor wiring loom.  Does anyone have any experience or advice on wiring the DRL wiring to the headlights.

 

Context:  The NA1 Miata had pop up headlights so there were dedicated Daylight Running Lights underneath the pop ups running on a separate circuit.

 

[MV8]

What do you want to know? If you have the full harness, it should be straight forward. The DRL controls the high beam bypassing the headlight relay (red/wht).

[scannon]

The Canadian Miatas have DRLs so if your donor wiring harness is from a Canadian Miata should be no problem. 

 

The Canadian Miatas had an extra bulb in the park lights so there should be a dedicated wire for them in the harness. 

 

Attached is a scan of the Canadian DRL wiring schematic for a 1992 Miata.  The scan didn't come through very well, send me a PM with your email and I will try sending another copy directly to you.

Edited November 9, 2022 by scannon
Add schematic.

[JohnCh]

If your wiring harness can't accommodate the DRL, you might be able to fabricate something simple with a relay.  For my car, I plan to use a relay that feeds power from a switched 12v+ to the DRLs (low wattage LEDs), and when the running lights are on, that circuit energizes the coil, cuts that connection, and turns the DRLs off.  This way the DRLs come on with the key but don't operate with the headlights on.  From a wiring perspective, I'm thinking:

 

87a = switched 12v+

87 = dead end

30 = 12v+ feed to DRL

86 = 12v+ from running lights

85 = ground

 

 

Does anyone see any obvious flaws with this approach or have a better way to do it?

 

Thanks,

John

[MV8]

I see no flaws in that. I'd probably use a main relay to feed pin 30 and let the headlight switch toggle 87/a between DRL and low beam, using a separate relay for high beam.

[JohnCh]

Thanks @MV8 I'll keep that change in mind when I get to that part of the project.  I have a lot of wiring to undo, redo, and replace before I even think about that part of the build.