Daytime Running Lights--DRL
07-09-2012, 12:35 AM
#1
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Daytime Running Lights--DRL
There have been several threads in various forums on this topic, but in reading them, I didn't get a clear picture of exactly how to do this modification on a 993. Here is what worked for me:
1. Remove relay 31 store it--you won't be replacing it.
2. Make a jumper wire about two inches long, with a male spade connector on each end.
3. Using the jumper wire, jump pin 3 to pin 5 in the socket for relay 31. These numbers are hard to read, but with a flashlight, you can see them next to the pin sockets.
Now the fog lights will be lighted when the ignition is in the "on" position, so they can function as Daytime Running Lights. They will still function as fog lamps, too, but will go out when the headlights are on high beam, as required by law in some jurisdictions. If you want the fog lights on even when the headlights are on high beam, just remove relay 34, put it away, and jump pins 3 and 5 in that relay socket, too.
This circuit is protected by a 15-amp fuse in slot 14 of the CE panel, so you don't need to fuse the jumper wires.
1. Remove relay 31 store it--you won't be replacing it.
2. Make a jumper wire about two inches long, with a male spade connector on each end.
3. Using the jumper wire, jump pin 3 to pin 5 in the socket for relay 31. These numbers are hard to read, but with a flashlight, you can see them next to the pin sockets.
Now the fog lights will be lighted when the ignition is in the "on" position, so they can function as Daytime Running Lights. They will still function as fog lamps, too, but will go out when the headlights are on high beam, as required by law in some jurisdictions. If you want the fog lights on even when the headlights are on high beam, just remove relay 34, put it away, and jump pins 3 and 5 in that relay socket, too.
This circuit is protected by a 15-amp fuse in slot 14 of the CE panel, so you don't need to fuse the jumper wires.
Last edited by BobbyT; 07-09-2012 at 01:16 AM.
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09-04-2012, 01:02 AM
#8
Nordschleife Master
Good info - thanks
09-05-2012, 04:07 AM
#9
Instructor
People never cease to amaze me, the car forums for cars with daytime running lights have many threads about how to turn them off, and here we have one about how to add them to a 993.
Your large shiny Porsche can easily be seen in daylight. Adding lights makes no measurable difference. (NHTSA Study 2008).
Why bother?
Your large shiny Porsche can easily be seen in daylight. Adding lights makes no measurable difference. (NHTSA Study 2008).
Why bother?
09-05-2012, 07:52 PM
#10
Rennlist Member
People never cease to amaze me, the car forums for cars with daytime running lights have many threads about how to turn them off, and here we have one about how to add them to a 993.
Your large shiny Porsche can easily be seen in daylight. Adding lights makes no measurable difference. (NHTSA Study 2008).
Why bother?
Your large shiny Porsche can easily be seen in daylight. Adding lights makes no measurable difference. (NHTSA Study 2008).
Why bother?
The add'l current draw puts more wear on the alternator and electrical system, which in turn is driven by the engine (small, I know, but everything counts!).
09-05-2012, 08:10 PM
#11
Rennlist Member
People never cease to amaze me, the car forums for cars with daytime running lights have many threads about how to turn them off, and here we have one about how to add them to a 993.
Your large shiny Porsche can easily be seen in daylight. Adding lights makes no measurable difference. (NHTSA Study 2008).
Why bother?
Your large shiny Porsche can easily be seen in daylight. Adding lights makes no measurable difference. (NHTSA Study 2008).
Why bother?
09-06-2012, 03:36 AM
#13
Nordschleife Master
Take a look at this Phillips website ... a very cool photoshop feature for DRL's 
http://www.daylight-led.com/cars/
Anything to make our cars more visible to the SUV crowd is a good thing
http://www.daylight-led.com/cars/
Anything to make our cars more visible to the SUV crowd is a good thing
Last edited by FlatSix911; 09-06-2012 at 04:35 AM.
09-06-2012, 07:41 AM
#14
Agent Orange
Rennlist Member
Rennlist Member
I think aftermarket LEDs look terrible in 99% of the applications.
As far as DRLs, it depends on the car and the lights. Some look cool and some don't. I personally like fog lights as DRL and have wired all my cars that way.
As far as DRLs, it depends on the car and the lights. Some look cool and some don't. I personally like fog lights as DRL and have wired all my cars that way.
09-06-2012, 11:29 PM
#15
Nordschleife Master
I think it really depends on the car ... and quality of the LED system
Last edited by FlatSix911; 09-08-2012 at 09:25 PM.