6700 electrical problem

When i turn on the air conditoner the fan wont come on and the alternator lifht comes on i cant figure out what is going on with it maybe something in the switch? Anybody have this problem before
thanks
 
When i turn on the air conditoner the fan wont come on and the alternator lifht comes on i cant figure out what is going on with it maybe something in the switch? Anybody have this problem before
thanks
Sounds like a bad connection. Start by checking the cab bulkhead connector underneath the steering motor.
 
There is... a relay under the instrument cluster that is responsible for providing power to the upper cab and A/c that can go bad also.. However your problem sounds more like a bad alternator, or one of the "fuse wires" at the starter solenoid is going bad or corroded?
 
Thank you i do rember that relay now i will check it out
Its really a ford headlight relay,,but its weakness is in the design of the ground on the relay being a piece of "copper against the outer housing". A little bit of corrosion and the relay will not fire. I have rewired them to a standard 25 amp relay.
 

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