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Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3304
Experience:  ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
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My truck is doing the same thing. It did have a qualcomm at

Customer Question

My truck is doing the same thing. It did have a qualcomm at on time and the gauges stopped working when the qualcomm cable fell on the ground and drug. Checked both fuse locations and the truck has all circuit breakers not fuses. Not sure if maybe there is another fuse for the datalink somewhere else?
Submitted: 11 months ago.
Category: Medium and Heavy Trucks
Customer: replied 11 months ago.
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Expert:  Jeremy replied 11 months ago.

My name is ***** ***** I will assist you with your question today.

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We can go back and forth as needed to help resolve the issue you are having. Follow ups are free after ratings, so rate in confidence!

What is the vehicle doing? You mentioned the qualcomm cable drub on the ground. Was it pulled?

Did you have the terminating resistor checked?


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Customer: replied 11 months ago.
The antenna is no longer on the truck. The cable that drug is the cable that would have gone to the antenna.
Expert:  Jeremy replied 11 months ago.

Did you unplug the qualcomm or is it removed as well?

Did you check the terminating resistor? Best way to check is wit ha ohm gauge on the data port. If the resistance is off, it will inform there is an issue in the data link and not in the cluster itself.

Check between pins C and D with the batteries disconnected. See that you are reading between 59 and 61 ohms. If you are reading any different, then you'll know there is an issue in the datalink cause by the qualcomm cabling or the terminating resistor.

If you are reading 60 ohms, the issue is at the cluster. This will narrow down the issue tremendously.

CLICK HERE for the pin chart

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