Blower Motor Relay only has Half Power

[Jaime]

I just bought a 97 Plymouth Voyager and I'm having a problem with the blower motor relay. On the right side it only has half the power it should have. Also the blower motor won't turn on by moving the switch inside the van, you have tap the relay and then the blower motor comes on. Then when the blower motor is on it will shut off when you put the van into reverse. When we jump the relay over to work from another relay, everything works great. Anyone have any suggestions on what could be the problem here?

Thanks

Jaime