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Try checking any ground wire related to the alarm. On my 1997 Ranger XLT w/4L V6/5 speed auto/it was a intermitant hood switch. When the switch lost contact, the alarm system triggered as though the hood was opened. Try jumping the switch with a wire. Take care not to touch the body. If the problem goes away, then replace the switch. This took my dealer's service dept. 3 tries to find it. Hope this helps.

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18y ago
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Q: Why does car alarm go off for no reason on ford ranger?
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