I can´t seem to get the signal lights to blink on my 82 Maxim 550. There are four new lamps in. I´ve tried both 1157´s and 1156´s. The lights come on but won´t blink. The rear right lamp is very weak. I want to try everything else before replacing the relay unit as I was told it is going to cost me $175 to bring it up from the states. It would suck to pay that and it not be the problem.