08 Freightliner Classic FLD 120 Detroit Series 60 14L won't start

2008 Freightliner Classic, won’t start. Turn key switch on truck cycles power like it should but when I press the start button I got nothing. If I jump the two posts of the solenoid on the firewall it will start. I have 12.46 volts at the key switch with it turned on.

I have tested the small input wire on the solenoid on the firewall while having the start button pushed down and only had 6.83 Volts??? The voltage seemed to be slowly bleeding down as well.

Replaced the key switch and solenoid on the firewall so far, any help would be appreciated.

 

Ok 10 4, I will try putting new ends on the smaller wires and see what I get. Thx for the reply.

Oh would anyone have a wiring diagram of the ignition system on my truck? Tried to find something but can’t seem to find anything.

 

Sweet Jesus it was just the relay on the bottom of the drivers side firewall. So there are two ignition relays on ‘08 Freightliner Classic, one under the dash in cab and one in the PDM on the driver side firewall

Not sure how the relay went bad from the truck sitting for a week but it did.