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CE2 Tach wiring using W terminal in Caddy with AHU swap question
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Topic: CE2 Tach wiring using W terminal in Caddy with AHU swap question (Read 5157 times)
November 15, 2013, 12:12:16 am
estimatd
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CE2 Tach wiring using W terminal in Caddy with AHU swap question
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on:
November 15, 2013, 12:12:16 am »
How's it going all? Been a while since I've poked around here, hope all is well for everyone.
On a mission right now to get a legit tach working in my AHU swapped Caddy. NGP did the swap and all the wiring some time ago, and to get a working tach, they took the mk3 tach signal and added a tach converter to work with a mk2 gasser cluster. It works great but I just want something more diesel oriented with the correct redline. So I got a MK2 TD ce2 cluster from Canadia that I want to hook up. I swapped out the speedo to the VDO mph one and hooked it all up, but sure enough the signal for the tach is different. I've done some searching around and I can't seem to find out how specifically to wire from a W terminal to a tach. I'm hoping I can figure most of this out using
http://www.a2resource.com/electrical/CE2cluster.html
as a bit of a guide but I'm just not sure on the wiring from the W terminal. Can I just run a wire from the W terminal directly to the tach pin out on the cluster harness?
I don't know much about wiring unfortunately (which was a huge reason for having NGP do the swap) so I'm hoping to find a bit of help. I've searched around a bunch but haven't seen the exact info needed.
Any help is appreciated, thanks!
Charlie
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Reply #1
November 15, 2013, 12:36:09 am
estimatd
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Re: CE2 Tach wiring using W terminal in Caddy with AHU swap question
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Reply #1 on:
November 15, 2013, 12:36:09 am »
So, sorry if this has been a subject relatively beaten to death, I just want to know how to wire it. It looks like "Thezorn" answered the question in a thread here ->
http://www.vwdiesel.net/forum/index.php?topic=31502.0
From the sound of it, yes, I just have to run a wire from the W terminal directly to the appropriate pin in the cluster...right?
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Reply #2
November 15, 2013, 02:04:19 pm
CRSMP5
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Re: CE2 Tach wiring using W terminal in Caddy with AHU swap question
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Reply #2 on:
November 15, 2013, 02:04:19 pm »
120a alt lacks w... has to be 90a.. or you have to mod the 120...
also the calibration will be wrong too.. serp is different... so you will need to access the "pot" inside the tach to adjust it..
feel free to ignore me on the 120a alt w if you wanna doubt me.. just telling ya.. tested/tried muliti and none work... its some type of engine load sensor for the comp..
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Reply #3
November 15, 2013, 02:11:29 pm
bbob203
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Re: CE2 Tach wiring using W terminal in Caddy with AHU swap question
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Reply #3 on:
November 15, 2013, 02:11:29 pm »
120 has no W. End of story.
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92 Passat wagon M-TDi
03 Jetta wagon TDi
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Reply #4
November 15, 2013, 05:26:07 pm
estimatd
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Re: CE2 Tach wiring using W terminal in Caddy with AHU swap question
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Reply #4 on:
November 15, 2013, 05:26:07 pm »
Ah, I see. I have no ac, no heat, no PS, it's really just a minimal setup, I wonder if 120 is necessary? If it is then I guess I better get soldering...
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Reply #5
November 15, 2013, 05:46:39 pm
bbob203
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Re: CE2 Tach wiring using W terminal in Caddy with AHU swap question
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Reply #5 on:
November 15, 2013, 05:46:39 pm »
I have a 90 amp in mine with headlight and heater running idle drops very slightly less than 50 rpm. I wish I could've used my 120 as I've heard these alts can't be opened without damaging them. Please make a how to if your decide to add a w to yours. you could probably just take and solder the wire that's on it where the w normally is to where a w would be soldered to to keep it plug in.
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92 Passat wagon M-TDi
03 Jetta wagon TDi
VE Timing tools for rent
Need a car transported a long distance? Pm me for details.
Reply #6
November 15, 2013, 05:48:35 pm
CRSMP5
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Re: CE2 Tach wiring using W terminal in Caddy with AHU swap question
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Reply #6 on:
November 15, 2013, 05:48:35 pm »
na diesel bunny no ac = 55a... so the 90a serp one is direct fit.. just gotta recalibrate the tach.. aka adjust its pot.. what we did on bbob's...
but if your 120a works... mod it... his was broken and we decided to put a 90a on it..
my 90a in my kubvan.. the only times it hits 60 amps is when the base kicks on 1 song... the amp gauge dances..
with hid's it draws less amps (hell gauge barly moves).. but thats only 15 or so amp for h4s.. blower.. wipers... not even close...
«
Last Edit: November 15, 2013, 05:52:42 pm by CRSMP5
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Reply #7
November 16, 2013, 12:26:59 am
vanbcguy
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Re:
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Reply #7 on:
November 16, 2013, 12:26:59 am »
Crazy, I was just going through Rock Auto today looking at alternators. There were 120A alternators available for the AAZ, and they are specifically listed as having "coupler for rev counter". There is a 120A alternator listed on my usual Canadian parts site too under the AAZ engine. Are they both wrong?
I was looking at listing for a 1994 Jetta.
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Bryn
1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen
Reply #8
November 16, 2013, 12:57:09 am
CRSMP5
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Re: CE2 Tach wiring using W terminal in Caddy with AHU swap question
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Reply #8 on:
November 16, 2013, 12:57:09 am »
i have seen 4 120a not have w.. actual hook up gauge.. on the tdi disconnected to see if tach worked.. and it did with the "w" not hooked up.. so what ever looks like 120 has w.. so far i cannot prove it does... but i bet it does not.. alt plug even has terminal that is hooked to a wire...
2 90a that do.. but the 120 plug fits the 90 and vice versa... and plugged into a 90 works.. but 120 does not..
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Reply #9
November 16, 2013, 07:39:33 am
bbob203
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Re: CE2 Tach wiring using W terminal in Caddy with AHU swap question
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Reply #9 on:
November 16, 2013, 07:39:33 am »
The terminal on the 120 amp TDi alt that isn't the exciter wire is not a W. Its like a d+ or something.
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92 Passat wagon M-TDi
03 Jetta wagon TDi
VE Timing tools for rent
Need a car transported a long distance? Pm me for details.
Reply #10
November 16, 2013, 07:43:27 am
theman53
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Holmes County Ohio - North Central Ohio
Re: CE2 Tach wiring using W terminal in Caddy with AHU swap question
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Reply #10 on:
November 16, 2013, 07:43:27 am »
Rabbit on roids had some 120 alt that had a W on it I think. Ask him what it was.
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http://www.vwdiesel.net/forum/index.php?topic=16572.0
Round 2
http://www.vwdiesel.net/forum/index.php?topic=31758.0
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CE2 Tach wiring using W terminal in Caddy with AHU swap question