Quote:
Originally Posted by Goody51
baddoglt
I leaned on the horn for 10 seconds and there was no change to the temperature of the positive wire. 
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It can take longer than 10 seconds for temperature to stabilize on a copper wire, given the degree of insulation surrounding the wire, the mass of copper on either side of the test point, etc. A better test would be to measure the voltage drop from the positive battery terminal to the horn terminal. If the wires in between are too small, you will see the voltage reduce as you move along the wire from the battery to the horn while the horn is sounding.