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Detected errors can illuminate the light and then clear themselves over time. There is a diag port on the right side of the dash but it takes a special reader. Over voltage from the alternator will short out the abs computer over time so check your gage.

I have them. Not 100% plug and play but close. There are a few threads on them.

Maybe just wires rubbed or a short from old age. I have all the parts. Might be time to upgrade to the 1st gen AC heater box. The controls are a lot nicer and you don't have to use the AC feature.

Drivers side of the engine its on the fuel pump. If the truck starts then its working.

The plastic tabs that hold the contacts in can fall out and the contact slip back. If the panel got wet in the past there can be green corrosion on the contacts. The contacts and tabs are replaceable.

jump it see if the truck cranks. If you have power at the breaker panel see if the fuel solenoid has 24v with the dash power switch on.

How do you know its bad?

First thing you need to make sure you have 4 good fully charged batteries and all the terminal connections are clean and on tight. Then go to the breaker panel with a multimeter and confirm you have 12 and 24 volts there on the left side binding posts. Once this is confirmed then we can move...

Under the spare tire. What is the problem you are having?

How did they change the gear in the middle axle. Never heard of that being done before.

If you are going air horn a Grover 1510 or copy of it will give you a very authoritive traffic clearing sound. I have them in my older 5 tons.

Wouldn't the lower bracket interfere with the alternator since its lower on the lmtv?

This thread is not intended to be a for sale thread. It is informational so everyone can get the parts they need at cost.

Maybe the valve behind the cab is bad or out of adjustment.

Took a while. I had some assistance from Firestone and Powerpacker tech support.

Maybe. But dont mess with them. Just asking for trouble. Come off a tank right to an 80-85 psi pressure protection valve then to the solenoid and horn wherever you mount it.

I didnt do the 1088 yet. I will go off one of the air tanks with a 80 or so psi protective valve.

Cab lift parts are made by Powerpacker. Firestone makes the airbag and sells it to Powerpacker who makes their own assembly. PP997900 is the new replacement air spring. No housing you have to reuse your old one. The spring bolts right in though. Available from Powerpacker for a cool $192.29 each...

I put a Whelen 100watt airhorn/pa in my 1078 and I have a Grover stuttertone airhorn I am going to connect with an air solenoid in my 1088. The horn is 24 volt in the truck.

I think the military lmtv C7 mounts the compressor low on the drivers side. It may use the same compressor bracket as the 3116.