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The horn relay is shared with the cigarette lighter. It is located near the spade connectors yp under the dash.
The horn is located behind the drivers side headlight. there is a wire inside the steering column that probably is broken. I've owned my 79 b2500 for 6 years 360 2bbl. only problems ive had is exaust,horn,and windshield washer tank.
When did your problem start> Did you replace something in the beginning?
If you're sure the fuse is okay, the next thing to check is the bulbs. If the bulbs are okay, the problem could be the turn signal relay, also called the flasher relay.
It takes a person to change it and not break it. TAke it to the auto trim shop. I use to have a '79 Volare coupe that needed the rear window replaced. Took it to a salvage yard. Not only did they have the window, but they replaced it themselves. It only cost me 35 dollars total for both the part, and labor.
They can be: 79+79+79+79+79+79+79+47 = 600
79 + 79 = 158
79.
79 + 79 = 158 / 2 = 79.
79 + 79 = 158
ANSWER: 66.3616% taken away from 79= 79 - (16% * 79)= 79 - (0.16 * 79)= 79 - 12.64= 66.36
a + 79