battery light stays on. Have a new battery & new alternator & eventually the battery is "drained".What' s wrong?!!

Asked by Nov 16, 2014 at 09:34 PM about the 1988 Ford F-150 STD Standard Cab 4WD LB

Question type: Maintenance & Repair

1988 F-150 Ford pick up 6cylinder  standard cab 4-WD. I don't know what LB or SB
means.

1 Answer

105,435

LB is a long box, SB is a short box. Disconnect one battery cable and put a test light between the battery terminal and the post, if the light turns on you have a draw that will kill a battery, the first thing to disconnect electrically is the alternator, if the light goes out then your new alt is bad, if it don't then you need to start removing fuses one at a time until the light goes out, taking note of what fuse went where, when it goes out then you need to find out what circuits are controlled beau that fuse, find the problem and fix it, then start putting the fuses back, if no more bright light, no more draw. Note: some vehicles have a parasitic load that may cause the light to glow very dimly, this is normal.

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