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#1
04-09-2009, 12:50 AM
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Electrical Smarties, help me wire some running lights
I would like to wire up the city light bulbs in my euro lights to act as daytime running lights. I would like them to be on when the ignition is on but the headlights are off. When the headlights are turned on I would like them to turn off. Is there any way I can easily do this with out using two relays?
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine 
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#2
04-09-2009, 11:22 AM
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Help us to help you--do the city lights have a separate ground or do they ground through the same ground the headlights use?
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 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#3
04-09-2009, 11:29 AM
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How many watts are the city lights? I thought they looked kind of like flashlight bulbs? If those are the ones I'm thinking of, then just hook them directly to an ignition source, and connect a relay in between activated by the headlights to cut them off.
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Ich liebe meine Autos! 1991 Mercedes-Benz 560SEL | Megasquirt MS3-Pro | 722.6 transmission w/ AMG paddles | Feind Motorsports Sway Bar | Stinger VIP Radar | AntiLaser Priority | PLX Wideband O2 | 150A Alternator | Cat Delete 1981 Mercedes-Benz 300SD | Blown engine, rebuilding someday... 1981 Mercedes-Benz 300SD | Rear ended, retired in garage. 2009 Yamaha AR230HO | Das Boot Excessive speeding? It ain't excessive till I redline!
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#4
04-09-2009, 11:32 AM
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It can be done with a single relay but keep in mind the current draw requirement for the city lights. IIRC, a 10% buffer is sufficient for resistive. Find the feeder side of a fuse that is powered with Key ON. Run power for the city lights through the Normally Closed contacts of the relay from the fuse box. Then go to the fuse for the headlights and connect to the power side of the relay. Connect the ground side of the relay to chassis and you should be good.
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Sam 84 300SD 350K+ miles ( Blue Belle )
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#5
04-09-2009, 11:58 AM
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I am pretty sure someone did a write up on this on the forum.
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o)
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#6
04-09-2009, 12:28 PM
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I hotwired to a fuse on my car. Not elgant but worked. Unhooked it again recently, I am going to redo this properly (running wire with loom).
-Rolf
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42
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#7
04-09-2009, 01:06 PM
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Quote:
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#8
04-09-2009, 01:21 PM
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HERE it is -if you have the Euro HL it says to run them to pin #3 on Euro connector
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BENZ THERE DONE THAThttp://www.peachparts.com/shopforum/...c/progress.gif 15 VW Passat TDI 00 E420 98 E300 DT 97 E420 Donor Car - NEED PARTS? PM ME! 97 S500 97 E300D 86 Holden Jackaroo Turbo D 86 300SDL (o\|/o)
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#9
04-09-2009, 04:57 PM
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I have wires running to pin 3, I just need to hook them up. The stock bulbs are 4 watts each, but I am planning to use these bulbs which are made up of 3 LEDs.
 I think you guys are right, hook them to a switched power source and add a normally closed relay with the switch wire running to the headlights. I'll let you know how it works. Thanks
__________________
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#10
04-09-2009, 05:49 PM
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It looks like you might have it covered, but here's my help anyway
 Go to radio shack and get a SPDT automotive relay. Connect switched +12v from the fuse box or wherever to terminal 30, and connect the power going to the light to terminal 87a. Connect the light's ground to ground. Tap the headlight's power wire and connect it to terminal 85, connect terminal 86 to ground. If you happen to have another light that you want to come on with your headlights, you can connect that to terminal 87. Otherwise, it would be best to cover it with something because it'll be hot whenever the headlights are on. Good luck, I'm interested to know how those LED's look.  (Image from here: http://www.the12volt.com/relays/relays.asp)
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1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now
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#11
04-10-2009, 06:23 PM
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I got them wired up like pizzachef suggested. I used the sunroof/rear power seat for the switched source and the parking lights for the relay coil input. Here is the relay inegrated into the fuse box (the blue one) and the stock light output.
 
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#12
04-10-2009, 07:07 PM
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Here is the LED light output. The light it puts out kind of blends into the sun's reflection. The LEDs make more of a point of light, where the stock bulbs light up the whole reflector. I do like the color the LEDs put out (sort of like those angel eyes newer BMWs have) and I think they should have a longer life span which will be good since they will be on almost all the time the car is being driven.
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#13
04-11-2009, 09:38 AM
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The LED color is kind of a "modern" look..do they light up enough to be seen on the road? Maybe on an overcast day it makes more of a difference. You should have lots of those when fall comes
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1985 300TD-euro 352,000 mi 1974 240D (1?)52,000 mi - has a new home now
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#14
04-12-2009, 11:56 AM
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One Question.
To wiper or not to wiper with Euros? That is the question.
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daw_two Germantown, TN Links: Sold last car --- 05/2012 1984 300D Light Ivory, Red interior No longer selling Cluster Needles Paint No longer selling New Old Stock (NOS) parts Past: 3/2008 1986 300SDL "Coda" 04/2010 1965 190D(c) "Ben" & many more
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