Originally Posted by Triker56
On my Freightliner chassis their is one on the chassis frame close to the starter that I had to replace once.
Same location on my F/L , only I've replaced mine twice.
To narrow your search area , 99% of the time the starter relay/solenoid will be between the chassis batteries and the starter, on my F/L that narrowed it down to a 3 foot area.
Picture is taken from the ground looking up to the passenger side frame rail behind the differential .
Relay on the left.