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Function of glow plug relay violet wire
I am trying to get a concensus on what you think is the function of the glow plug relay violet wire (1985 300D). I have a light bulb A connected from violet wire to ground and another bulb B connected from the glow plug output to ground so i can see what's going on without having to deal with volt meters.
When the key is on, bulb B is on (i.e. glow plug getting power), bulb A is off. As I turn the key to crank, bulb A goes on and bulb B stays on (bulb A and B dims due to additional drain from starter motor). When engine fires and I release the key, bulbs A and B go off. From this observation: 1. Is it behaving correctly? 2. What is the function of the violet wire? My take from this observation is the violet wire resets the glow plug relay and removes power to the glow plugs once engine starts. Agree, disagree? Other opinions?
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked Last edited by funola; 01-09-2014 at 01:39 PM. |
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You got it. The violet wire is the starter signal to the glow relay to stop glowing. In an afterglow relay, it's the trigger to start the afterglow countdown. Cutting the violet wire is a cheap permanent afterglow mod.
Sixto 87 300D |
#3
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Quote:
Those who insist that the glow plugs do not operate during start are invited to take note.
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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl. Last edited by tangofox007; 01-09-2014 at 02:24 PM. |
#4
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You are right.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
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Cut the Violet Wire, run it to a Switch in the dash, then it could off in cold weather for the after glow, and switched back on in the warm weather.
Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
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Or just pull the wire out of the plug, tape it back and then put it back in spring. A little cleaner IMO. Then again I have that big open button hole on my console.... HMMM
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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 |
#7
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Cutting the wire or wiring a switch is the wrong way to do it.
Cutting the violet will give you after glow, after glow time will be the GP relay timeout time. However, cutting the wire or wiring a switch is the wrong way to do it. The right way is to tie it to the temperature of the engine with a thermo switch. It takes a bit of doing but is well worth it. If engine is warm then no after glow otherwise yes. This will prolong the GP life, you do not want the GP to be on for approx 45s every time the engine starts.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#8
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in my e300 - the afterglow time is controlled by engine temperature sensor wire that goes to the glow plug relay. The violet wire is starter trigger.
so in effect - the system will be live when the GP lamp in on, when cranking and on (depending on temperature) for afterglow. The afterglow never happens if I start the engine with its temperature above 50C.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
#9
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A white Wire comes up from the small Terminal on the Starter Solenoid and connects to the Violet Wire at the Wire Terminal/Junction Block that is in front of the Battery. In My case If I disconnect the Violet Wire at the Wire Termnial Block and apply it to the side of the Block that connects to the Battery I can hear the Glow Plug Relay Click on. In order to test that on a Non-turbo Engine I believe you need to disconnect the Violet Wire down at the Starter Solenoid and apply some Positive Voltage to it.
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84 300D, 82 Volvo 244Gl Diesel |
#10
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The Glow Plugs have the ability to heat the Pre-chamber to a higher temp then the maximum Engine compression can do by merely cranking the; especially during Winter temps. And, the heat is localized right in the Pre-chamber.
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84 300D, 82 Volvo 244Gl Diesel |
#11
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Why does the violet wire need to turn the glow plugs on again while the starter is cranking, when the glow plugs are already "on" from the previous event of turning the key to the "on" position?
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#12
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When the Key is turned to start it goes past and disconnects the Pre-Glow and reconnects when the Starter is Cranking. If the Pre-glow and Starter were connected together you would start cranking as soon as you turn the Key to Pre-glow As to the Engineering why I don't know. What puzzles me is why is there to Relays inside the Glow Plug Relay.
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84 300D, 82 Volvo 244Gl Diesel |
#13
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the relays inside the glow relay are to isolate the circuits. and when those relays fail, the glow relay can actually actuate the starter! (it happened to my car)
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#14
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Research the concept known as "Hot in RUN and START."
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When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl. |
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