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I have a 2005 Navistar 7600 series. Neither horn works. City…

I have a 2005...

I have a 2005 Navistar 7600 series. Neither horn works. City horn or the air horn.

Mechanic's Assistant: What is the complete model and serial number of your machine?

Serial # 1htwyahr75j035215

Mechanic's Assistant: Are you fixing this yourself? What have you tried so far?

Model 7600

Mechanic's Assistant: Anything else you want the equipment mechanic to know before I connect you?

Working on it myself.

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Answered in 7 hours by:
3/17/2018
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 2,032
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter
Verified
Hi there . My name is ***** ***** Have you tried powering the horns manually to see if they are good ? Have you also tried having someone push on the horn button while checking for power and ground at the horn connections?
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Customer reply replied 5 months ago
I have. There is no clicking sounds at all and I can't find any fuse's or relays.
I believe that is because it is controlled by the electrical system controller ...or body controller
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Have you tested for power and ground getting to the horn itself though ... With a test light or multimeter ? Have an assistant push on the horn button well you go underneath and test with a meter for power and ground right on the horn itself
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If you see Power and ground on the horn with a multimeter while the horn button is being depressed, that tells us that the horn button and body controller are doing their job and the horn needs to be replaced.
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As far as the air horn goes , you need to disconnect the air line to the horn , air up the truck to 120 psi and try the air horn button to see if any air comes out of air line at the horn . If not , it is likely because the solenoid is corroded on the solenoid board mount on the left hand inside frame rail next to the transmission.
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Hi there . Looking for an update ! Do you still need help ?

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Perhaps a phone call might be better to explain further in details and I can also help with wiring diagrams

Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 2,032
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter
Verified
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Andy
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 2,032
2,032 Satisfied Customers
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter

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