Ok, right now and no money. I'd take a jumper wire and connect to pos batt term, touch term that closes relay to see if it closes. If it does, look for reasons it's not getting voltage required. Clean all connections including mount to firewall, fender or wherever it's mounted. The fact that it stays closed indicates it's getting some voltage at least. You may have a manual adjustment to control how much force it takes to close it. Corrosion, dirt, etc. could also be hindering it. It's just been too many years since I've been inside one. Good luck, I despise replacing parts till I prove them bad.