M915 dashboard switch and indicator light question

[ASITool]

I'm having difficulty determining the purpose of a push button and associated orange indicator light on the dash. They are located on the panel with the light and engine retarder switch. The push button is on the lower right corner of the panel and the indicator light is in the middle left. I do not find them listed in the operators manuals so I assume they are a later modification. Do any other M915a1 owners have these two on the dash? Any help with figuring out what they do is appreciated!

 

[Castle Bravo]

On my Allison modded M916, I have a similar light in the same area as yours that serves as a check transmission light. I'm not sure about the button, perhaps its for the electric horn... The horn button on my steering wheel is missing and they put a button on the dash instead.

 

[CBR Metalworks]

Self destruct button. Don't push it!


My 915a1 does not have either of those two.

 

[porkysplace]

Did the truck have a ether injection system added to it ?

 

[Old Lincoln County Iron]

Not on either of my 2 M915a1's .

 

[ASITool]

I pushed the button and it didn't blow up!

I think the two are connected because one of the wires from the switch goes to the indicator light. I'm attempting to trace wires.

 

[ASITool]

I don't think its related to the Ether because that button is to the lower left of the tachograph. The blue wires on this switch look like they were added later with butt connectors. One side appears to come from the circuit breakers and the other goes to what I think is an ABS box on the firewall. I can't figure out why the ABS system would need a light attached to the switch and how a momentary switch would be related to the brake system.

 

[Old Lincoln County Iron]

Looks like your truck is a newer rebuild with a/c added. Maybe its an update in the later rebuilds. My trucks were 04 and 06 rebuilds.

 

[av8or]

Not sure of the purpose, but was added in the 2006 and later rebuilds.

 

[NDT]

Just guessing, maybe the light is a warning light like what you see on ABS equipped semitrailers. Maybe the pushbutton switch is a reset? I bet if you do some research using the Bendix P/N you will figure it out.


For sure having air conditioning envy.

 

[royalflush55]

I have seen one truck that had an ABS label above the light, but the button in question was not labeled. This was on a rebuilt M915A1.

 

[royalflush55]

I'm having difficulty determining the purpose of a push button and associated orange indicator light on the dash. They are located on the panel with the light and engine retarder switch. The push button is on the lower right corner of the panel and the indicator light is in the middle left. I do not find them listed in the operators manuals so I assume they are a later modification. Do any other M915a1 owners have these two on the dash? Any help with figuring out what they do is appreciated!

Is this ABS light supposed to be on all the time to indicate it is working?
Ok, This light comes on when you start the truck. Then when you get to moving the light goes out to show that the ABS is working. I had to drive it a few hundred miles after sitting quite a while for it to work right. I still do not know what the shiny push button is for that is wired to this light.