Hi, DRL's, or Daytime Running Lights are not so you can see where your going.
They are supposed to be used for alerting other drivers of your prescence.
Old Volvo's had them in the Parking light fitting.
Buses have them in the headlights (sorry Coaches).
If you fit them, they should turn off when you turn on your headlights.
Not a hard thing, just a relay.
NC when headlights are off and open when the headlights are on.
This supplies power for your DRL's.
The feed via an ON/OFF switch, for your control relay, should come from the parkers.
This means you need 2 different relays to do the job.
1. So you don't forget to turn them off.
2. So your tail-lights are operating as well.
3. Fog lights, white or yellow, should be wired the same way.
DRL's should be a diffuse light so they are noticeable.
They should NOT be a pinpoint beam so they dazzle.
That's where diodes FAIL for this purpose.
People take shortcuts and it ruins it for everybody else.
It's laziness based on "She'll be right.".
And it isn't right, it's half-arsed at best.
That's why people have always been encouraged to turn on LOW Beam in daytime.
Especially for low visibility conditions, Fog, smoke etc..
Hope this helps.
