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weldwadeMale Offline
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Post Icon Posted: Mar. 15 2006,7:57 am Post # 1 see this member send this member a private message  quote this post in reply
:angry The tach in my truck seems to have a mind of its own. Its a 03 Chevy 6.6 Duramax. Most of the time it reads from 2500 to 4500 even at idle. Does anyone know if there is a tach pickup or sending unit? the needle drops to zero when the key is off so its not stuck.  :banghead

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Post Icon Posted: Mar. 15 2006,9:48 am Post # 2 see this member send this member a private message  quote this post in reply
Yikes... Any warranty left???

When I have a wireing problem, I just run new wires in the boat..  With a wire harness on a new vehicle, who knows???


Good luck!  :good  My Googles for wireing diagrams were not sucsessful :(

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Post Icon Posted: Mar. 15 2006,10:25 am Post # 3 see this member send this member a private message  quote this post in reply
Took care of that for you McCord...

Wade, doesn't the tach drive off a pully???  Might just be a loose connector under the hood.

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weldwadeMale Offline
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Post Icon Posted: Mar. 15 2006,10:41 am Post # 4 see this member send this member a private message  quote this post in reply
Quote (Sleek-Jet @ Mar. 15 2006,10:25 am)
Took care of that for you McCord...

Wade, doesn't the tach drive off a pully???  Might just be a loose connector under the hood.

Fock, I don't know. I've been trying to find info on it for a week. I guess I'm going to have to take it to someone, hopefully not the dealer. :beat

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Post Icon Posted: Mar. 15 2006,10:43 am Post # 5 see this member send this member a private message  quote this post in reply
Quote (Sleek-Jet @ Mar. 15 2006,10:25 am)
Took care of that for you McCord...

Wade, doesn't the tach drive off a pully???  Might just be a loose connector under the hood.

:good  Thank ya :good

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Post Icon Posted: Mar. 15 2006,11:30 am Post # 6 see this member send this member a private message  quote this post in reply
Just guessing here but doesn't the computer have something to do with the cluster readings including the tach??   I know when my '02 fuel guage would fluctuate from full to empty and everthing in between they replaced the complete cluster.

Just thinking out load here.  :stupid
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Carrera EliteMale Offline
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Post Icon Posted: Mar. 15 2006,12:02 pm Post # 7 see this member send this member a private message  quote this post in reply
The older GM diesels tach ran off of the alternator some how, but I'm not too sure how they drive them on the newer ones. I have a call out to see if I can find any more info for you.....

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Post Icon Posted: Mar. 15 2006,12:13 pm Post # 8 see this member send this member a private message  quote this post in reply
According to your discription, they are telling me that it sounds like a bad cluster. It seems to be a common problem. They said that a rebuilt cluster should be around $325.

Edited by Carrera Elite on Mar. 15 2006,12:13 pm

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weldwadeMale Offline
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Post Icon Posted: Mar. 15 2006,12:31 pm Post # 9 see this member send this member a private message  quote this post in reply
Quote (Carrera Elite @ Mar. 15 2006,12:02 pm)
The older GM diesels tach ran off of the alternator some how, but I'm not too sure how they drive them on the newer ones. I have a call out to see if I can find any more info for you.....

Yep, found that out with my Dads 93 6.5, long story short a larger alt pully really focks up your tach.

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weldwadeMale Offline
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Post Icon Posted: Mar. 15 2006,12:32 pm Post # 10 see this member send this member a private message  quote this post in reply
Quote (Carrera Elite @ Mar. 15 2006,12:13 pm)
According to your discription, they are telling me that it sounds like a bad cluster. It seems to be a common problem. They said that a rebuilt cluster should be around $325.

:good Thanks CE, can I buy one or is it a dealer only item?

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Post Icon Posted: Mar. 15 2006,12:36 pm Post # 11 see this member send this member a private message  quote this post in reply
They Suggested Dicks Speed-O-Tach
(602)279-6463
4325 N.7th st.
Phx

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Post Icon Posted: Mar. 16 2006,9:21 am Post # 12 see this member send this member a private message  quote this post in reply
Thanks for the info CE, I will give them a call. :phone

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Post Icon Posted: Mar. 17 2006,4:53 am Post # 13 see this member send this member a private message  quote this post in reply
Why don't you just put an Autometer in!??.. :stupid
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weldwadeMale Offline
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Post Icon Posted: Mar. 17 2006,5:04 am Post # 14 see this member send this member a private message  quote this post in reply
Quote (GoFastRacer @ Mar. 17 2006,4:53 am)
Why don't you just put an Autometer in!??.. :stupid

I have been told that the autometer tach for diesel applications is not as accurate as it should be. I really dont know I have never used one on a diesel. The same guy told me that the pickup the tach used also quit working more than once. I called a place here in Tucson yesterday and the place CE recommended and they both said they can fix it, I am going to go that route this time.

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Post Icon Posted: Mar. 17 2006,7:00 am Post # 15 see this member send this member a private message  quote this post in reply
COOL!! Glad you found a place a little closer!! :D

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weldwadeMale Offline
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Post Icon Posted: Mar. 17 2006,9:15 am Post # 16 see this member send this member a private message  quote this post in reply
Quote (Carrera Elite @ Mar. 17 2006,7:00 am)
COOL!! Glad you found a place a little closer!! :D

:good Dick's was familiar with the problem and told me that they have fixed many, common prob with POS GM electronics. I'm going to have them do the job, thanks again CE. :good

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Post Icon Posted: Mar. 17 2006,9:24 am Post # 17 see this member send this member a private message  quote this post in reply
They have fixed a few for athe place a friend of mine works, so far so good....

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Post Icon Posted: Mar. 18 2006,5:58 am Post # 18 see this member send this member a private message  quote this post in reply
Quote (weldwade @ Mar. 17 2006,6:04 am)
Quote (GoFastRacer @ Mar. 17 2006,4:53 am)
Why don't you just put an Autometer in!??.. :stupid

I have been told that the autometer tach for diesel applications is not as accurate as it should be. I really dont know I have never used one on a diesel. The same guy told me that the pickup the tach used also quit working more than once. I called a place here in Tucson yesterday and the place CE recommended and they both said they can fix it, I am going to go that route this time.

Well the tach don't know what it's on, it has to be the electronics that it's connected to not giving a good signal!.. :stupid
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Post Icon Posted: Mar. 18 2006,10:01 pm Post # 19 see this member send this member a private message  quote this post in reply
probably the cluster there about $295.00 maybe able to do better than that, but you will need a dealer with a tech 2 to
diagnose it cause it's all controlled by the pcm.

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