Question about 1989 Ford F 150

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Battey sparks when hooking positive up

Charged battery for a long time with only the positive side unhooked, when hooking back up it sparks

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You should always disconnect the neg. side of the battery when you disconnect. This is prevent a power surge to the ECM. The sparks you find is it's detecting something is on. It could be as small as the radio constant (memory).

Posted on Jun 23, 2008

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or.
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Your car I think was bad about one of the cooling fan relays sticking "on". Just something to be aware of.

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