Edmunds Answers

Voted Best Answer

  • avatar zaken1 05/18/10 3:15 am PST

    It is normal to hear a relay click when the battery cable is successfully reconnected. Your problem sounds just like what happens when the battery cable clamps and/or the battery posts need cleaning; or when the battery cable clamps are not tightened adequately on the battery posts. This can happen on either the negative or positive posts or clamps. Try using a professional type battery cable service tool (which has a multi bladed tapered reamer to cut a clean straight edge on the inside surface of both the positive and negative clamps; and also has two different sized blade scrapers to scrape corrosion off the negative and the positive battery posts). This tool should create a shiny ring around the battery posts, and also create a shiny ring on the inside edge of the cable clamp. After the clamps are reinstalled; they should be tight enough on the posts that they cannot be rotated at all by hand pressure. If a cable clamp can be moved by hand, and the clamp bolt is tight; it will be necessary to use a hacksaw to cut metal out of the spot where the two clamp halves touch. That should add enough room for the clamp to be tightened further. If a clamp is worn or eroded too far to be tightened; the clamp should be replaced with one of the same design. Some original ground cables also have a second smaller ground wire going from the clamp to the vehicle body. If the ground cable is replaced; the replacement cable often will not include the auxiliary ground wire to the body. In that case; a new ground wire from the negative cable clamp to a body bolt must be added. If the second ground wire is missing; it can create intermittent open circuits which can produce the symptoms you described.

Answers

  • zaken1 05/18/10 3:15 am PST

    It is normal to hear a relay click when the battery cable is successfully reconnected. Your problem sounds just like what happens when the battery cable clamps and/or the battery posts need cleaning; or when the battery cable clamps are not tightened adequately on the battery posts. This can happen on either the negative or positive posts or clamps. Try using a professional type battery cable service tool (which has a multi bladed tapered reamer to cut a clean straight edge on the inside surface of both the positive and negative clamps; and also has two different sized blade scrapers to scrape corrosion off the negative and the positive battery posts). This tool should create a shiny ring around the battery posts, and also create a shiny ring on the inside edge of the cable clamp. After the clamps are reinstalled; they should be tight enough on the posts that they cannot be rotated at all by hand pressure. If a cable clamp can be moved by hand, and the clamp bolt is tight; it will be necessary to use a hacksaw to cut metal out of the spot where the two clamp halves touch. That should add enough room for the clamp to be tightened further. If a clamp is worn or eroded too far to be tightened; the clamp should be replaced with one of the same design. Some original ground cables also have a second smaller ground wire going from the clamp to the vehicle body. If the ground cable is replaced; the replacement cable often will not include the auxiliary ground wire to the body. In that case; a new ground wire from the negative cable clamp to a body bolt must be added. If the second ground wire is missing; it can create intermittent open circuits which can produce the symptoms you described.

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