I just hooked up some hadley air horns to my truck last night. I tested the air compressor, solenoid, and switches and the system worked fine. I ran the compressor and solenoid power to the battery, disconnecting the battery cable to place the wire terminal under the existing battery cable. Because I didn't have time to install the swithches last night, I disconnected all electrical connection to continue today. This morning, I tried to start my truck and it would not start. The dash light is on for batteries. Because I disconnected the battery terminals, is that the problem? I checked them and they are on tight. I still do not have any power attached to the compressor or solenoid. Please advise.

 

You mean it won't turn over or it turns over but won't start?
Most likely its a connection or you drained the battery..

 

It turns over, but won't start. I thought the battery might be drained, so I placed a battery charger on it for 6 hours and it still won't start. All electrical components work and I did not loose my presets on my radio. Head lights look bright when I turn them on. I have checked the battery connection and it is tight.

 

Check all fuses you might have caused one to blow

 

I just got back in town from a business trip starting on Monday. I had the truck towed to the dealer and he repaired it. He said it was a crank sensor and a fuse box in the engine area. He said Ford has a replacement fuse box out and I will have to bring the truck in later to get the new fuse box installed. Thanks for your input.

 

Sounds fishy to me its one or the other not both....That would be lottery odds.