Homemade Wiring Harness/ Now Truck Won't Crank

[Scorer128]

HELLO GENTLEMEN!  It looks like I've really done it now.  The 1980 U model I've been working on was having intermittent electrical problems and I found that chaffed wires were causing serious issues.  For two weeks I attempted to piece fix the harness and finally tore the whole thing out and replaced the wires per the schematic. minus the Kyser shutdown wiring.  Now, the engine barely cranks over .  Is there something in the scensors that would be telling the engine not to turn? I've read about a jump wire but dont' have enough information to assertain the proper location.  Any help or insight would be  greatly appreciated the old girl has a job waiting on her.  not to mention my pride could use some help!!

[carlotpilot]

a 1980 u mack has very little in the way of sensors .sounds like weak or dead batteries to me ` check them out first then all ground cables  and connections

[Scorer128]

thank you sir  i have check cleaned and tightened ground wires.  I have put the charger on.  ( fingers crossed, thats it!)  But to clarify, if I omitted the Kyser wiring and possibly not removed a wire, would that  affect the crank? 

[Scorer128]

whew!! Thank you , you were absolutely right and I was overthinking it!! Batteries just needed a boost!!

[carlotpilot]