I got a plug in on the wifes typhoon that i have a question about.It is on the back firewall to the left of the distributor.There are 2 plug ins there.On her truck one has a relay attached to it the other does not. The one that doesn't has a yellow wire someone cu t and left taped up.It has the same end as the relay next to it but again no relay is this needed and if so for what...