# Pro-lock security system **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** explorer, ford\ **Created:** [October 18, 2008, 9:49pm UTC](https://community.cartalk.com/t/pro-lock-security-system/20890 "2008-10-18T21:49:05Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![mindispower](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mindispower/32/5634_2.png) [@mindispower](https://community.cartalk.com/u/mindispower)\ **Post date:** [October 18, 2008, 9:49pm UTC](https://community.cartalk.com/t/pro-lock-security-system/20890/1 "2008-10-18T21:49:05Z")
1991 Ford Explorer. Would’nt start so put in new batt and starter incl solenoid. When key is in Pro-lock, hear a loud mechanical knock and no start. Remove key from Pro-lock and no knock. In both cases, all electricals turn on. In both cases, after trying to start, there is a rhytmic click coming from under the left dash where relays etc live i their little caves. HELP! Please…