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That is excellent advice, I really appreciate it. I will do the shop supply to the gladhand test before going further, to be sure. Thanks

Thanks Mullaney! I take my excitement in small doses. And definitely not in a 9 ton truck going downhill with brakes and hope fading fast...

Thanks Mullaney and Ron. Good to know! Yes, I recall the first time the air ride lifted the cab, that was an interesting moment for sure, this being my first truck with air brakes, etc. The truck is a first generation A0 with the CAT 3116. I live in an area that has a lot of hills and long...

Progress report... After a lot of debugging, it appears I may have resolved some of the issues with the air brake gauges. I went all over the truck and found a few small air leaks and kinked lines (nothing major though). Then I replaced the two air pressure transmitters under the dash...

I will do that, once I sort out my wiring issue. I found the troubleshooting section of the TM which gives the detailed instructions on checking for 24 V sender signals, at the PX4 and PX5 connectors on the back of the air pressure gauges and also how to check the grounding between the sender...

One easy question that the manuals offer conflicting advice on: Which is the Front and which is the Rear air pressure sending units? TM Hi, I am getting conflicting info from a couple of the TM's, on which transmitter is for Front Brake Air and which is for the Rear. See two pages below, which...

Thanks, I better go over the wiring in detail with my voltmeter. I bet I have broken a wire somewhere. Thanks again for your help and especially the wiring schematic.

That makes sense. I wondered how the low pressure switches informed the system to turn on the low pressure indicator lights. So, I conclude that if I wire the senders opposite to the way the TM seems to state, then both front and rear air pressure gauges peg high when I hit the power switch...

I am scratching my head on this one - the air brake guages have stopped working. I've got a first-gen M1078 A0 truck, mostly in excellent running order. Apart from needing to replace some rotten connectors on marker lights, it worked pretty well from when I received it from Memphis Eq. Been...