you cant tell anything by the bottom. you have to cut the Solder off and open the Case up. Then you will See the Contact in there. If the Contact is Worn Off , You can Fix it by Re soldering it. Which will save you 60-90$$. Since Brand New one from a dealer one is pretty expensive. before you buy a new one check it out and check the resistance on the main relay. and it might not be your main relay from what you say. it can be your Ignition Switch. Check everything before you buy a new thing. hope it helped.