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According to the NCRS 70-72 manual, 72 had only one horn from the factory. It must be wrong, because the 72 I just bought had three and the previous owner had it for 40 years and they didn't say they changed anything. Plus, the green wire that ran from the horns under the car to the relay in the battery box was the same green color that GM used for other wiring. I am convinced that they are wrong again.
The A.I.M. is pretty clear that it had just one horn and it was electrically activated. What is on your car are three horns that are compressed air activated...and a compressor.
Mine came with 2 sets of horns, one under the hood and one that looks like this one on the front hood. I think the one on the front hood could have been a dealer installed option.
I bought my 1968 in May 1970 from the original owner. It had zero modifications when I bought it. NCRS says it should have two horns but mine has three, all behind the grill and all painted in the original flat blackout paint.
GM/Chevrolet would never have approved locating the horns [or anything else] behind the grill, as those were NEEDED passages for airflow thru the radiator (along with the airdam-directed airflow up and thru the lower valence. Cooling airflow was an "issue" to begin with. It was surprising enough that the 'parked' headlamp buckets and the black plastic shields for them contributed to barely-adequate airflow.
11-07-2018, 09:15 PM
NCRS judging manual wrong again?
