Robsraptor

There's a couple materials o rings are made of, some are ok with fuel some are not. I don't recall what material is good for fuel, personally I'd just go to my Mack dealer and get them, but my dealer's parts department is competent. They have no problem looking up parts for my 79 r686st. Doesn't mean every part is still available from Mack, but they are competent enough to look it up and find out. (Bergey's in Franconia, PA)

What is the part number for the injector O-rings on a 1992 EM7? Is there any aftermarket places to get them besides the Mack dealer? Can I just use standard o-rings?

Thanks in advance.
 
 
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I searched for this but couldn't find anything on it.  I have a 1992 CH613.   It was a 2 axle tractor that was turned into a water truck. (By the previous owner)  The headlights turn off when you turn the ignition on.  The circuit breaker for the headlights starts clicking like crazy.  I don't have a schematic but it seems to me that the ignition circuit is drawing power from the headlight circuit.  Let me know any ideas.  Thanks in advance!