Searched around and still confused. Trying to get my tach to work. Found a bunch of threads about it. Here's what I did, I took the wire from #47 on the 3.3.1 DME which was pin 20 on the X20 and ran a wire from there to the black wire on the blue connector at the instrument cluster. Still nothing. Keep in mind I have ripped a lot of junk out of this car. I dont really have the yellow instrument cluster connector hooked to anything because everything came out. So I just have that plugged in and grounded just in case. I've looked thru the ETMs and of course they dont have all the info there, but I cant figure out what I'm doing wrong here. Lights work on the instrument cluster, not sure if the speedometer works cause I haven't driven it yet, the other gages are not hooked up cause I got seperate ones...... Any thoughts? Thanks!
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you need to provide power to the tach as well, Im not sure where the power comes from on a late car. -
I assumed the instrument cluster had power because the idiot lights work. You think the tach is getting power separately?Comment
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The original connection was black wire behind tach to pin #1 C104 which is near the DME location on 1987 325s.
From there it was a black/blue wire to the pin#6 of the old DME connector.
On the E36 engine loom, locate the engine speed pin on the DME connector, locate the black wire and run it to pin 1 of C104.
Perhaps the tach is faulty?
mComment
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I know, here's where I am confused. you look at the ETM and it says, from DME pin 6 thru C104, C235, C103 to pin 7 on C1. It never tells you what C1 is, but I read somewhere that it was the blue connector on the instrument cluster. Here's my issue, my C104 connector is attached to the yellow connector harness. And the black wire in that connector just runs from one connector to another. There's a yellow/white that also runs from one connector to the other, then the green/red runs to the OBC relay box...... So I read that I can just go from pin 22 straight to black wire on blue connector, so thats what I did. I may try the instrument cluster in my other car to make sure that the tach works, but it worked 4 years ago before the teardown.
By the way, the yellow connector harness from the instrument panel I dont have going to anything, cause I ripped all that out. Most of it went to the OBC anyway, I was wondering if I really need that OBC??Comment
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You don't really need the OBC if you don't want it. I am putting a gauge pod in its place. The OBC just gives info like time, milage, etc.
what car did the motor come out of? I could get you the DME pinouts for that so it would be a simple hookup
Don't know if this will help, but here are the wiring diagrams for an 1988 325ic
And here is a diagram of your connectors
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I have the bentley to both cars. I have the pin outs. Pin 47 from the DME sends the instrument cluster the engine speed. I know I have it wired to what the ETMs say. Am I missing another wire? The thing I dont understand is the C104 is not on the blue connector (C1) its on the yellow one (C3). Right now I dont have anything connected to the yellow connector harness except I grounded it, just incase I needed it.Comment
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what do you mean you grounded the yellow plug? i hope you didn't just connect every wire in it to ground...
My tach died when i was messing around under the dash with the battery connected(yes i know.. :( ) turns out i burnt up one of the paths on the circuit board. You could crack open the cluster and check the boardComment
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Ha ha... No, I don't really have anything for the yellow connector harness to attach to so at first I didn't have it in there at all, but when I was looking at the ETMs I might have thought it need the other ground path from the yellow connector. So I just plugged it in and grounded the 2 brown wires.Originally posted by MattM View Post
Maybe your right, I'm going to try and swap the instrument cluster with the other car. Does anyone see any problem with an 87 to an 88 instrument cluster? I know there some wiring differences. The 88 engine speed goes thru C101 on the 88 and C104 on the 87.Comment
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I have a '90 "i" cluster in my '87 S50 ETA. You should be fine.Need a part? PM me.
Get your Bass on. Luke's r3v Boxes are here: http://www.r3vlimited.com/board/showthread.php?t=198123Comment
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First I was going to try the 87 in the 88 to see if it works and that way if I wired something wrong I dont blow up the other one. One is a VDO and one is a motometer.. Is that ok?Originally posted by ck_taft325is View PostComment
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I have heard the Moto's are backwards compatible but the VDO's are not. Iswapped an 89 I car's cluster to an 87 eta and it worked, but not vice versa. What year IS this car? 88? If so I would go to the salvage and grab one and put in fresh SI batt's.:nice:Originally posted by 325ProjectzComment
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Man this pisses me off. All week I thought something was wrong with my wiring job. I swapped the instrument clusters and of course the tach works. Any thoughts on why the tach doesn't work anymore?? Do I need to get an instrument cluster? I heard that someone replaced the batteries or something and it worked for them.. That doesn't make any sense to me. All those are for are the oil change service lights.Comment
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Heres what happened to mine, had to add the wires to make it work, notice the burnt up black line the wires are replacing...
The S.I board Batterys doesn't make sense to me either, i can have the board completely removed and my tach works fine....
And you should be able to completely remove the Yellow plug harness, it is all for the OBC.. Cars that didn't come with an OBC didn't have it at all..Last edited by MattM; 02-26-2011, 05:29 PM.Comment
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Originally posted by MattM View PostHeres what happened to mine, had to add the wires to make it work, notice the burnt up black line the wires are replacing...
The S.I board Batterys doesn't make sense to me either, i can have the board completely removed and my tach works fine....
And you should be able to completely remove the Yellow plug harness, it is all for the OBC.. Cars that didn't come with an OBC didn't have it at all..
Great info. Yeah, I didn't think I needed it either, I ran it without it in there and it ran fine just the tach didn't work. I opened it up and didn't see anything burnt like that. I think I'm going to check out the junkyard on monday. I shouldn't second guess myself, I was positive I wired it right.Comment
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