Question about 1990 Ford F150
If your battery light comes on, you either have a bad battery, bad
alternator or poor connection somewhere in the charging system. While a
F-150 can drive for a brief period without proper operation from the
charging system components, odds are the car will not start once it has
been shut off without the assistance of a jump. Trys this test:
1. Put on your gloves and remove the battery cables from the battery, using the battery terminal wrench. Remove the negative cable first.
2.- Clean any corrosion from the battery terminals and cable ends with the battery terminal cleaner and brush. Clean the inside of the cable ends to ensure a solid metal-on-metal contact once you reconnect the cable to the battery terminal. Visually inspect the battery cables; if there is any significant corrosion buildup on the cables, replace them.
3.- Reconnect the battery cables, positive side first.
4.- Check to see if the light is still coming on. If not, monitor it for the next week or so while driving. If it is still coming on, move to step 5.
5.- Take the flashlight and visually follow the battery cables away from the battery. At each connection, make sure the cables are making proper contact and do not have any corrosion built up at the connection. If there is corrosion, disconnect the negative battery cable from the battery, then disconnect the cable from the site of the corrosion and clean the area with the cleaner and brush. Reconnect the cables, connecting the negative to the battery last, once you have it cleaned. Continue to clean and inspect the cables until you have inspected them all. Recheck the battery light when you are done. If the light stays off, monitor it for the next few days. If it is still on, move to step 6.
6.- Drive your Town Car to a repair facility and have the alternator and battery tested. In the event you cannot drive it, you can either have it towed to the repair shop or remove the alternator and battery and take them to a parts store to have them tested.
Also, I suggest check with ths scan tool for other fault codes there.
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Posted on May 15, 2010
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Posted on Jan 02, 2017
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