Fender top mount turn signals

Could be an issue with your turn signal switch. The fender mounted signals take a special switch as the fender mount lights run through the switch. Mine don't work on my 74 Valiant...and I suspect the switch has failed. Replacement switch on Ebay is $86 bucks. A standard switch is usually about $26 bucks....

Seems odd that a different switch would be required. Maybe due to higher amperage? Not sure what kind of bulb is in there, but an idea would be to put in some little LED's, almost zero amps and last long. Or change out all the signals to LED for a cool look and very low total amperage.