Need a longer dbw harness - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dme922 · 07-01-2016, 10:07 PM

Im running a 5.3 truck motor and due to where i am mounting my ecm my dbw harness is to short. Any suggesting on who makes an extension or longer harnesses?

**mongocanfly** · 07-01-2016, 10:16 PM

When I bought my psi harness the dealer told me I could get it made in custom length if needed..my next one will be custom length due to me mounting ecm under or behind the seat as well as maf sensor pigtail being a little longer,,

dme922 · 07-01-2016, 10:18 PM

Thanks for the help

Badger69 · 07-03-2016, 08:21 AM

I just bought the correct color wiring and extended it myself. Soldered and heat shrank each slice. Took about 20 minutes.

Willie Makeit · 07-04-2016, 04:24 PM

$40 worth of junkyard harness, soldering iron, solder and heat shrink will fix it. its just wires, not magic.

dme922 · 07-04-2016, 09:54 PM

I got in touch with John at Modern Vintage System and he is making me one thats 7 foot long at a very good price.

BR3W CITY · 07-05-2016, 12:47 AM

IMO on DBW components I prefer re-pinning the harness instead of extending it. The DBW wires can be soldered, but it needs to be done VERY sparsely. Those circuits are a mix of 1.5v and resistance signals, both of which are fairly sensitive to incremental changes. Overheating of the wire, or over use of the solder or flux can create a hot-point and change the resistance across the wire. Not something to be done unless your very confident with the solder, and preferably have fine electronics soldering experience.

This can cause error codes if it creates values outside its range, or provide skewed signals which IMO can be frustrating and sometimes dangerous for both the engines health and driver control.

Most of those WeatherPak connectors can be disassembled with a thin flathead, and each wire de-pinned from the connector. The pins can be ordered in bulk if they cannot be reused. Then the custom length wires can be measured and cut, pinned into the connector and installed. Its a pain, but its a really nice way to get your own "custom" harness, it requires less talent then solder, and looks soooo nice when done.

Custom 68 · 07-05-2016, 10:50 AM

Thats interesting Brew, I am working on a gen 5 harness and was making my DBW stuff and just going at it. It will give me something to look at if I do throw some errors. I had added some wire and a disconnect trying to make a nice clean setup maybe the thing to do but know I know what to look for if it gives me fits.

65Gregg · 07-05-2016, 11:18 PM

Quote:

Originally Posted by Badger69

I just bought the correct color wiring and extended it myself. Soldered and heat shrank each slice. Took about 20 minutes.

Where did you find the wire that matches the various colors found in the GM harness?

BR3W CITY · 07-05-2016, 11:25 PM

Trailer supply places, any automotive wiring retailer online, and some good electronics or electricians supply house (just be wary that your not buying construction wiring, which isn't vibration resistant).

**Wgesnerjr** · 07-06-2016, 05:28 AM

Not sure if this will work for you or not.
http://www.ebay.com/itm/181718006939...%3AMEBIDX%3AIT

**Hart_Rod** · 07-07-2016, 01:49 PM

Quote:

Originally Posted by dme922

I got in touch with John at Modern Vintage System and he is making me one thats 7 foot long at a very good price.

65Gregg · 07-07-2016, 10:53 PM

Quote:

Originally Posted by BR3W CITY

Trailer supply places, any automotive wiring retailer online, and some good electronics or electricians supply house (just be wary that your not buying construction wiring, which isn't vibration resistant).

I guess I wasn't clear, I've never seen wire available that follows the color schemes (2 color combinations) found in the factory LS harness. I would want to stay with the correct colors for any future trouble shooting.
I assumed Badger had found a source.

Badger69 · 07-17-2016, 10:47 PM

I found a guy at a swap meet that had rolls of gm-type wire.

07-01-2016, 10:07 PM	#1
dme922 Registered User Join Date: Mar 2012 Location: Gallipolis, Ohio Posts: 296	Need a longer dbw harness Im running a 5.3 truck motor and due to where i am mounting my ecm my dbw harness is to short. Any suggesting on who makes an extension or longer harnesses?

07-01-2016, 10:16 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,670	Re: Need a longer dbw harness When I bought my psi harness the dealer told me I could get it made in custom length if needed..my next one will be custom length due to me mounting ecm under or behind the seat as well as maf sensor pigtail being a little longer,,

07-01-2016, 10:18 PM	#3
dme922 Registered User Join Date: Mar 2012 Location: Gallipolis, Ohio Posts: 296	Re: Need a longer dbw harness Thanks for the help

07-03-2016, 08:21 AM	#4
Badger69 Registered User Join Date: Jan 2014 Location: Madison, WI Posts: 66	Re: Need a longer dbw harness I just bought the correct color wiring and extended it myself. Soldered and heat shrank each slice. Took about 20 minutes. __________________ '69 C10 \| LS2 \| 4L70e \| 4 Wheel Disc Brakes \| Accuair eLevel \| 20" steel wheels \| Porterbuilt goodies \| Push Button Start \| Tilt \| Cruise '79 Burbo \| 2wd \| 8100 Vortec/Allison swap \| A/C \| soon to be bagged.

07-04-2016, 04:24 PM	#5
Willie Makeit Registered User Join Date: Oct 2013 Location: Alabama Posts: 1,234	Re: Need a longer dbw harness $40 worth of junkyard harness, soldering iron, solder and heat shrink will fix it. its just wires, not magic.

07-04-2016, 09:54 PM	#6
dme922 Registered User Join Date: Mar 2012 Location: Gallipolis, Ohio Posts: 296	Re: Need a longer dbw harness I got in touch with John at Modern Vintage System and he is making me one thats 7 foot long at a very good price.

07-05-2016, 12:47 AM	#7
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Need a longer dbw harness IMO on DBW components I prefer re-pinning the harness instead of extending it. The DBW wires can be soldered, but it needs to be done VERY sparsely. Those circuits are a mix of 1.5v and resistance signals, both of which are fairly sensitive to incremental changes. Overheating of the wire, or over use of the solder or flux can create a hot-point and change the resistance across the wire. Not something to be done unless your very confident with the solder, and preferably have fine electronics soldering experience. This can cause error codes if it creates values outside its range, or provide skewed signals which IMO can be frustrating and sometimes dangerous for both the engines health and driver control. Most of those WeatherPak connectors can be disassembled with a thin flathead, and each wire de-pinned from the connector. The pins can be ordered in bulk if they cannot be reused. Then the custom length wires can be measured and cut, pinned into the connector and installed. Its a pain, but its a really nice way to get your own "custom" harness, it requires less talent then solder, and looks soooo nice when done. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

07-05-2016, 10:50 AM	#8
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: Need a longer dbw harness Thats interesting Brew, I am working on a gen 5 harness and was making my DBW stuff and just going at it. It will give me something to look at if I do throw some errors. I had added some wire and a disconnect trying to make a nice clean setup maybe the thing to do but know I know what to look for if it gives me fits. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

07-05-2016, 11:25 PM	#10
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Need a longer dbw harness Trailer supply places, any automotive wiring retailer online, and some good electronics or electricians supply house (just be wary that your not buying construction wiring, which isn't vibration resistant). __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

07-06-2016, 05:28 AM	#11
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Re: Need a longer dbw harness Not sure if this will work for you or not. http://www.ebay.com/itm/181718006939...%3AMEBIDX%3AIT __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project

07-17-2016, 10:47 PM	#14
Badger69 Registered User Join Date: Jan 2014 Location: Madison, WI Posts: 66	Re: Need a longer dbw harness I found a guy at a swap meet that had rolls of gm-type wire. __________________ '69 C10 \| LS2 \| 4L70e \| 4 Wheel Disc Brakes \| Accuair eLevel \| 20" steel wheels \| Porterbuilt goodies \| Push Button Start \| Tilt \| Cruise '79 Burbo \| 2wd \| 8100 Vortec/Allison swap \| A/C \| soon to be bagged.



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