1991 Suburban Speed Hut Speedo install problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ballencd · 03-20-2021, 07:27 PM

Hey Guys,

I have just installed a Speed Hut electronic speedometer in my 1991 V1500 Suburban. 5.7 TBI, 700R4, 241 transfer case.
Long story short....it does not work. The error I get when setting up the speedo is "No Signal". I am hooked to the pin 18 light blue w/black line which I believe comes from the DRAC and I expected it to work. I tried ground and no ground.

Any ideas?? I could use some help on this.

Thanks

ballencd
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Name: IMG_3040.jpg
Views: 378
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**Corts60** · 03-22-2021, 11:49 AM

Just a thought: have you individually tested that the VSS is working?

ballencd · 03-22-2021, 04:28 PM

I assume it is working. When I took out the old speedo it was working but I don't know how to verify that.

Ryan Hubbard · 04-03-2021, 11:55 PM

I would just take the signal straight from the transmission sensor to the gauge, bypassing the DRAC.

ballencd · 05-16-2021, 04:15 PM

I got it fixed. Had to install a "pull up" resistor on the signal line for the speedo to work.
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Apparently when I pulled the factory dash I also pulled the pull up resistor. IT works great now. I still need to tilt all the gauges back so I can see them as the factory dash will not allow that. I am going to build a aluminum dash and reinstall the gauges. Name: IMG_3040.jpg
Views: 243
Size: 42.6 KB

Name: IMG_3040.jpg
Views: 243
Size: 42.6 KB

It might be hard to see in the photo but the gauges little toward the driver and make it hard to see them.

03-20-2021, 07:27 PM	#1
ballencd Registered User Join Date: Aug 2013 Location: Columbus, NC Posts: 83	1991 Suburban Speed Hut Speedo install problem Hey Guys, I have just installed a Speed Hut electronic speedometer in my 1991 V1500 Suburban. 5.7 TBI, 700R4, 241 transfer case. Long story short....it does not work. The error I get when setting up the speedo is "No Signal". I am hooked to the pin 18 light blue w/black line which I believe comes from the DRAC and I expected it to work. I tried ground and no ground. Any ideas?? I could use some help on this. Thanks ballencd __________________ 1983 M35 (bobbed and converted to dump) 1984 M1010 1988 Chevy Suburban (5.7TBI/TH700R4/NP208) 1991 Chevy Suburban (5.7TBI/TH700R4/NP241C)

03-22-2021, 11:49 AM	#2
Corts60 Just here to tinker Join Date: Jun 2008 Location: Holland, MI Posts: 3,697	Re: 1991 Suburban Speed Hut Speedo install problem Just a thought: have you individually tested that the VSS is working? __________________ 78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold)

03-22-2021, 04:28 PM	#3
ballencd Registered User Join Date: Aug 2013 Location: Columbus, NC Posts: 83	Re: 1991 Suburban Speed Hut Speedo install problem I assume it is working. When I took out the old speedo it was working but I don't know how to verify that. __________________ 1983 M35 (bobbed and converted to dump) 1984 M1010 1988 Chevy Suburban (5.7TBI/TH700R4/NP208) 1991 Chevy Suburban (5.7TBI/TH700R4/NP241C)

04-03-2021, 11:55 PM	#4
Ryan Hubbard Registered User Join Date: Aug 2007 Location: Mission Viejo, CA Posts: 288	Re: 1991 Suburban Speed Hut Speedo install problem I would just take the signal straight from the transmission sensor to the gauge, bypassing the DRAC.

05-16-2021, 04:15 PM	#5
ballencd Registered User Join Date: Aug 2013 Location: Columbus, NC Posts: 83	Re: 1991 Suburban Speed Hut Speedo install problem I got it fixed. Had to install a "pull up" resistor on the signal line for the speedo to work. Apparently when I pulled the factory dash I also pulled the pull up resistor. IT works great now. I still need to tilt all the gauges back so I can see them as the factory dash will not allow that. I am going to build a aluminum dash and reinstall the gauges. It might be hard to see in the photo but the gauges little toward the driver and make it hard to see them. __________________ 1983 M35 (bobbed and converted to dump) 1984 M1010 1988 Chevy Suburban (5.7TBI/TH700R4/NP208) 1991 Chevy Suburban (5.7TBI/TH700R4/NP241C)



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