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73-87 Chevy _ GMC Trucks => Interior & Equipment => Topic started by: kgross401 on March 17, 2024, 02:31:28 PM
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Question what does the control module do or control?
I have a short some were in wiring could the control module be bad and causing the short?
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Way too vague! ANY power wire or appliance that passes current to ground inappropriately can be the cause of a short.
Which control module are you questioning? What makes you think there is a short? Are fuses melting? Which fuse(s)? Describe the symptoms and when they occur.
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Got smoke? ;D
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the control module which is under dash above gas pedal I unplugged it and everything still works.
The problem I'm having with fuse popping is labeled horn which is above the bat single pin when I plug fuse 20A in (horn slot) it pops as soon as i push it in.
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You may have a short in the steering column horn wire. Disconnect the steering column wire connector and then you can check for a short to ground in the column. If OK, check the rest of the wires to the fuse!
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The horn fuse also feeds power directly to the adjacent BAT power taps on the fusebox and through the orange 240 circuit, to the dome lamp, cigar lighter, and factory clock option. Are wires plugged into the BAT power taps below the horn fuse? Unplug any wires connected to the BAT fusebox taps then unplug the horn relay, remove the orange wire from the back of the cigar lighter, and unplug the cluster-mounted factory clock (if it has one). Install a new fuse to see if it continues to pop. If the fuse doesn't blow, reconnect the wires to the BAT power taps, horn relay, cigar lighter, and clock, one at a time, to determine which circuit is compromised. Report what happens.
Mike, the black horn wire that runs through the steering column is a switched ground for the relay. If it chafed to ground the horn would sound continuously. It wouldn't blow the fuse.