GMC 1976 ZEO 6083 Maintenance Manual page 635

12- 30
CHASSIS ELECTRICAL
LAMP OFF
Replace Relay
Ground Okay
Poor Ground'
Replace Horn Repair Ground
Horn Continues
To Blow
Replace Relay
l . Disconnect Green Wire
From Terminal On
Horn Relay.
2. Ground One Lead of 12-
Volt Test Light And
Touch Other Lead To
No . 3 Terminal (Green
Wire On Relay).
3. Push Horn Button .
RELAY CLICKS
LAMP ON
Check For Poor
Ground At Horn .
HORN BLOWS
l . Connect Green Wire
To No . 3 Terminal On
Relay.
2. Touch Test Light Lead
To Wire In Connector
At Horn .
3. Push Horn Button .
LAMP ON
Repair Open In Wire
From Relay To Horn .
CONTINUOUSLY
Disconnect Black Wire From Horn
LAMP OFF
Relay
HORNS
Horn Stops Blowing
1 . Disconnect Directional
Signal Switch Connector.
2. Connect Test Light To
a 12-Volt Source .
3. Touch Test Light Lead
To Black Wire Terminal
In Directional Signal
Switch Connector.
INOPERATIVE
LAMP ON
Remove Horn Button
And Touch Test Light
Lead To Horn Contact
Assembly
LAMP ON
LAMP ON
Check For Broken
Ground Strap.
OKAY
Repair Ground At
Wire From Horn
Contact.
RELAY DOES NOT
CLICK
Ground One Lead of a 12-Volt Test
Light and Touch Other Lead To
Black Wire (No. 2) Terminal On
Horn Relay.
Touch Test Light Lead
To Two Black Wires In
One Terminal In Directional
Signal Switch Connector
LAMP OFF
Replace Relay
1 . Check For Dirty Contact
At ConrSector or Horn
Relay.
2. Repair Open Circuit
In Wire From Relay
To Directional Signal
Switch Connector.
LAMP OFF
Repair Open In Wire
From Directional
Signal Switch Connector
To Horn Contact.
BROKEN
Replace Ground
Strap
A-1814
Figure 45-Horn Diagnosis Chart
LAMP ON
LAMP OFF
Repair or Replace
Repair Grounded Wire
Grounded Horn
From Directional Signal
Contacts or Wire
Switch Connector To
In Switch .
Horn Relay.