1989 4.9 I-6 something draining my battery.

Asked by Feb 01, 2014 at 05:35 PM about the 1989 Ford F-150 S Standard Cab LB

Question type: Maintenance & Repair

I have - 1989 ford f150 4.9 -6 my battery dies overnight. There seems to be a hissing
sound like a electronic part still on when I shut the engine down.it seems to be coming
from the back of block. Help need assistance

2 Answers

21,355

Make sure there are no lights staying on ,dome, glove box under hood.

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Had the same problem with my Windstar. disconnect battery ground and use a test meter. hook one side to battery terminal and other lead to battery cable. should read .60 millie amps if not start pulling fuses until u find the right one. might have to tape sensor for doom light. mine was reading 1.7 millie amps. parasitic draw is what it is called

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