tach on a 2003 gmc diesel

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dfiddy

Copper - Posts: 162

Joined: August 17, 2002

Location: Canada

Posted: November 03, 2004 at 10:13 AM / IP Logged

i need this wire for r/s, and right now it remote starts and dies, but with the key it is fine.

i am going behind the gauges so is it light blue, or the dark blue?

thanks for any help!

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snguyen

Silver - Posts: 281

Joined: October 09, 2003

Location: United States

Posted: November 03, 2004 at 10:17 AM / IP Logged

Looks like you need a bypass. What model of GMC do you have?

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dfiddy

Copper - Posts: 162

Joined: August 17, 2002

Location: Canada

Posted: November 03, 2004 at 10:27 AM / IP Logged

the starter is done, and it does start just not all the time, i used a 555l and python starter, the truck is a gmc 2500 hd with a duramax

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gus1

Gold - Posts: 1,013

Joined: October 15, 2003

Location: Canada

Posted: November 03, 2004 at 12:24 PM / IP Logged

Tach is white at the instrument cluster. Glowplug is dark blue.

Gus

Wherever I go, that is where I end up......

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outtaluck72

Copper - Posts: 155

Joined: August 04, 2003

Location: United States

Posted: November 03, 2004 at 3:59 PM / IP Logged

why not try voltage sensing if your alarm will let you. it will save you some time.

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johnnydi77

Copper - Posts: 54

Joined: May 17, 2004

Location: United States

Posted: November 03, 2004 at 6:54 PM / IP Logged

the cluster comes out really easy so I think you should take it out and tach is right there...it's the only white in there.

John J. DiStefano Jr.

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audiopro111

Copper - Posts: 160

Joined: September 24, 2004

Location: United States

Posted: November 04, 2004 at 6:25 PM / IP Logged

remove the 4 corner screws of instument cluster they should be 7mm then pull cluster toward u in the plug thats connected to instrument cluster u will only find one white wire that is the tach wire

AudioPro111

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slab42

Copper - Posts: 56

Joined: March 18, 2003

Location: United States

Posted: November 07, 2004 at 9:50 PM / IP Logged

yeah, make sure you are using the "wait to start" wire mentioned above (glow plug)

also, i know the 04's have a factory feature where you cannot over crank the starter, or double start it. try putting the key in, let the glow plugs warm up, and crank it over, but don't turn the key back once it is started, leave it in the crank position for a few extra seconds. if the starter disengages without you turning the key back, then the 03 has the same feature. why does this matter? set your RS for tachless crank, (voltage) and turn the crank time up to the max... the truck will not allow it to over crank!

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tach on a 2003 gmc diesel

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