HELP - problems with pyro guage...

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Bought some VDO Vision guages (EGT, transmission, & boost)the other day. Decided to go ahead and temporarily install the EGT guage while I wait for my 3 guage a-pillar setup to arrive. I got the pyro installed and the wiring hooked up, but the guage doesn't move at all. The multi-tester shows 12+ volts to the guage, but I don't know how to check to see if the pyro is sending the proper signal. What is the typical voltage range for the 400 degree VDO pyro? Also, how do you go about checking the pyro signal using a multi-meter?

My bad luck is that Summit is out of stock on the VDO pyro kits, so I will have to wait about 2 weeks to get a replacement. #ad


Steve


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2001 2500 SLT QC LWB 4x4, AT, 3. 54 anti-spin, tow package, camper special, snow plow prep, travel group, SRW, RKE, fog lights, agate cloth interior, bright white exterior, Cody gooseneck hitch.

Looking to add guages, beef up the auto transmission, and add MORE power!

 

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When mine was suspect (it turned out to be bad) I put the multimeter on ohms, attached the probes to the leads and used a lighter for a heat source. There should have been a sheet with the thermocouple to give the resistance at different temps. Anyway, without that, you will see the resistance begin to change very quickly once you start to heat it. Remove the heat and the resistance will change quickly in the other direction.

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2001 HO 6 spd 2500, 4. 10 LSD, Towing Package, Electric Brakes, EGT/Boost Gauges, Running Boards, K&N,
Real Backup Lights

 

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12 Volts is required for the light only!

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'93 LE W250 5spd 3. 54 White Reg Cab
190,000 Miles 07/31/00

 

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I'm not sure about VDO,but all the pyros I've dealt with only require 12v for the lighting. If power is applied to the sender,it's sure to fry it. I hope the 400 degree gauge is a typo error,as 400 will be barely over idleing temperature. Good luck

 

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The VDO requires 12-V. There is an internal amplifier that needs power.

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David Dressler
2001 Driftwood 3500 Quad Cab 4x4, 155 inch WB, 5. 9L HO Cummins Diesel (ETH), 6-Speed HD Manual (DEE), SLT+, 3. 55 Anti-Spin Axle, Camper Special Group, Trailer Tow Group, Leather, Sliding Rear Window, Jacob's E-Brake, Rhino Liner, VDO Vision (pyro, boost, engine oil temp. ), Weather Guard Diamond Plate Saddle Box, AND functional Halo light!
"Diesel, it's not just for breakfast!"

 

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Zman,

Most thermocouples used for pyros are "K" type units. They differ slightly, but the average output is ~22uV per degree F. They normally are zeroed @ 32F.

Example... If the temp was 80F, then 80-32=48. 48 X 22uV = 1. 056mV Your meter would read . 001 volts DC. A uV is. 000001 VDC, a mV is . 001 VDC. This is why some gauges use an amplifier, because the signal is so small. If you have a good DVM, you should be able to see if it's working. Email with any ??'s if I can help.

Dave

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2001 2500 ISB,4X4,QC,SB,AUTO,3. 55's,BLACK,AGATE LEATHER,SLT,every option except heated leather/4whl anti

 

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My goof. The 400 degree was for the transmission temp guage. The EGT pyro is matched to the guage and is good for 1600+ degrees. The guage and pyro came as a kit, but for some reason, it didn't include any info on the probe itself.

I'll try the lighter trick and check the ohms. Thanks for the info!

Steve

[This message has been edited by zman (edited 08-07-2000). ]

 

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On the back of my DiPricol EGT gauge, there was a small wire connecting the two terminals. That wire was a packing material and had to be removed before the gauge would read anything. The instructions that came with it said nothing about having to remove it. I had to call TST, the seller, to ask them why my gauge was not reading anything and found out I need to pull that wire off. I don't know if the VDO is like that or not, but you might want to check that possibility out.

[This message has been edited by Koa Man (edited 08-07-2000). ]