wiring merc 300ce
Printed From: the12volt.com
Forum Name: Vehicle Wiring Information & File Requests
Forum Discription: Request Car Alarm, Car Stereo, Cruise Control, Remote Starter, Navigation, Mobile Video, and Other Vehicle Specific Wiring Info, Manuals, Tech Tips
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=132541
Printed Date: May 01, 2025 at 6:12 PM
Topic: wiring merc 300ce
Posted By: benelectrical
Subject: wiring merc 300ce
Date Posted: November 01, 2012 at 6:45 AM
wiring request Merc 300CE
hey guys im in need of a wiring diagram for merc 300ce for the central locking ( pump)
i know the wires to hook up for central locking but need the wiring for the pump it self
there is a 3 pin plug ( only 2 terminals needing to be used )
and their is a round plug with green, blue and yellow, not sure what spots they are supposed to be
any help would be great thanks -------------
Replies:
Posted By: howie ll
Date Posted: November 01, 2012 at 8:47 AM
The green blue and yellow are the control wires, blue one side front, green the other and yellow the boot switch.
Wire up as Mercedes/Audi vacuum pump with a 3 second delay (that depends on year which you haven't given.
Diagrams here in relay section.
There's also a total close wire on some early nineties variants.
You can also pick them up in the front floor looms, in rubbery tubing along with a RED / white and a BROWN / black.
If you start with "Hey Guys" again I will visit Oz and strangle you.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: benelectrical
Date Posted: November 02, 2012 at 6:55 AM
thanks
it is a merc 1989
i understand the wires you are talking about.
i have attached a picture, you can see the
2pin straight plug what wiring and or switching has to be connected to them
and also the 3 pin plug, looking at it from this angle which wire connects where
btw u are a life saver, and i wont say that again ahaha -------------
Posted By: benelectrical
Date Posted: November 02, 2012 at 7:00 AM
sorry it wont let me upload it. are u able to send your email via pm or thru here
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Posted By: howie ll
Date Posted: November 02, 2012 at 10:55 AM
No point, you have the colours go from there.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: benelectrical
Date Posted: November 02, 2012 at 6:23 PM
i cant just hook it up. the wire are all burnt out
the wires have no isulation just copper
i need to re-run the wires but need to know what feeds and switching the pump needs and on what terminal -------------
Posted By: howie ll
Date Posted: November 02, 2012 at 7:11 PM
I've got no wiring diagrams which is what you will need.
I can tell you that logically the other plug will be your RED / white fused 8 or 16 amps, engine bay fusebox marked central locking and brown to ground (earth).
There's a dead short somewhere.
Otherwise the fuse would have blown unless some idiot previously placed a much larger capacity fuse there.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: 91stt
Date Posted: November 02, 2012 at 9:41 PM
take a look at this, it should be all you need
300CE wiring diagram------------- This information is provided only as a reference.
All circuits should be verified with a digital multi-meter prior to making any connections.
Posted By: benelectrical
Date Posted: November 03, 2012 at 2:07 AM
yer howie from the back story i think someone bypassed it at the fuse box, now its a bloody mess. burnt out need to re-wire
but shouldnt be to bad im not going to worry about the pump trigger wires, iv fitted an alarm with 3 sec pulse to trigger it.
thank you so much 91stt, that is perfect exactly what i needed -------------
Posted By: howie ll
Date Posted: November 03, 2012 at 2:50 AM
Common, I even got the colours right all from memory!
Haven't done one of these in 20 years they changed everything about 92.
The only mistake was thinking it might have been 8 amps.
When I get my memory back I'll tell you about the total close wire.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: howie ll
Date Posted: November 03, 2012 at 3:26 AM
This info is for right hand drive, UK, Oz, etc.
This is from memory so PLEASE verify.
12v+ Red links at fuse box*.
Ignition pink/red** ignition switch loom, you will have to remove instrument panel to get at it.
Starter purple ditto.
Indicators BLACK/ white, BLACK/ green (+) hazard switch or fuse box*.
Door triggers front BROWN / grey, at either door switch rear BROWN / white at either door switch or rear dome/courtesy light switch adjacent to hazard switch.
Trunk (boot) trigger. Check the plunger switch it might be POS (+). If so just turn around the switch wiring so it switches NEG (-) and POS (RED / yellow?) is the supply.
Total close thin either yellow/blue or blue / YELLOW in one of the driver floor looms, should be together with a RED / white and a BROWN / black use an aux to supply a 15+ second neg on arm/lock.
*Open engine bay fuse box unscrew and lift fuse holder out of the way, that will give you access to the listed wires.
**If R/S, multiple ignition wires, at least 2 or more.
BTW removing instrument panel trim pull to ease sides and push forward from behind will give you space to the left for the alarm ECU and a good factory earth (ground) nut directly beneath.
Tach will be a GREEN/ YELLOW at rear of instrument panel or a diagnostic socket in engine bay.
That generation used a dealer supplied hood switch mounted just in front of fuse box or left hand side on inside wing bolts, or fit one to the front striker.
The first choice, either already there, from a dealer or wreckers yard (plastic they don't corrode)is your best choice.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: benelectrical
Date Posted: November 03, 2012 at 3:50 AM
 -------------
Posted By: benelectrical
Date Posted: November 03, 2012 at 3:55 AM
https://cgi..au/ws/eBayISAPI.dll?VISuperSize&item=160896466917
hey i cant get a picture to come on, but here is a link
if looking at the pump, which wire should go where
the 2 pins and the circle plug
i can re run the wires to the diagram just dont know where they go. -------------
Posted By: benelectrical
Date Posted: November 03, 2012 at 3:59 AM
Posted By: howie ll
Date Posted: November 03, 2012 at 4:12 AM
It doesn't matter if you get it wrong, you will either blow a fuse or the locks will lock when they should unlock and vice versa.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: howie ll
Date Posted: November 03, 2012 at 4:13 AM
And fleabay links don't work from this site for obvious reasons so try to copy and paste.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: benelectrical
Date Posted: November 03, 2012 at 4:19 AM
true. but becuse it was all discconected i dont know what goes where at all
the 2 pin plug - what wires connect to them?
and the 3 pin plug what wires are for that plug?
hoping to wire it and get it all working tomorrow -------------
Posted By: howie ll
Date Posted: November 03, 2012 at 4:28 AM
Oh come on this is an easier job once you redo the burnouts and eliminate the cause.
This is beginners work.
The RED / white and brown to one plug, the yellow, blue and green to the other.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: benelectrical
Date Posted: November 03, 2012 at 4:34 AM
iv never had to deal with central locking on merc, repairing side of things
bit of a pain in the ass lol -------------
Posted By: howie ll
Date Posted: November 03, 2012 at 4:35 AM
Actually the easiest system going once you understand it.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: benelectrical
Date Posted: November 03, 2012 at 4:36 AM
lol easier than toyota, holden, etc orginal system. or aftermarket system, no way
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