- Last seen
- Joined
- Sep 23, 2020
- Thunderbird Year
- 1966
We have chronic issue with charging system. Headlights will eventually kill the battery if we our out for an evening drive. Didn’t last 15 minutes the other night. Stopped for an ice cream and car wouldn’t start. Got a boost and drove home. Tinkered with it in driveway next day. Battery voltage is stable when idling and lights off. Voltage drops below 11 volts in less than 15 minutes idling with headlights on. Alternator was replaced several years ago with 65 amp Wilson. Battery is 12 years old but we use a battery tender over the winter. We put on about 100 miles/year. Need some coaching on troubleshooting. Thanks.