The trick is to check for a short somewhere in the electrical system. Here is what I found on my MPV: check the wiring inside the vehicle on the passenger side under the dashboard near the fire wall. The on-board computer (i.e., metallic box mounted right above where the passenger's feet would be) has a large number of wires going into it. We found a wiring union about 5 inches from the computer that was unshielded. It was shorting out against the metal case of the computer periodically, blowing the engine fuse. Use electrical tape to insulate the connection. (If I remember correctly, the wires were black and white.)
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Its on the fuse box cover
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beneath the seat
By the passenger's left foot
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Check for a blown fuse.
the negative cable is the one tha go to the chassy or the engine . And the positive go to the fuse box.