Question about 1994 Buick LeSabre

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How can I check the wiring of an auxillary horn button?

Something is draining the battery, and the horn problem is the latest work.

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  • nolagirl Aug 11, 2009

    When testing continuity of wires, should the battery be disconected? or the key off?

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Grab a volt-ohm meter from Ace for $15 and switch it over to test current (set it to the smallest number, like 200mA instead of 10A, so that you can catch even tiny current). Poke the ends at the wires going through the horn (or other suspected culprits). If the item is sucking juice, you will see current flowing through it. This works for this application because the components that could drain your battery while you are away are wired in parallel (so if one component goes out, the whole car doesn't go out like christmas lights and also for better electricity distribution).
This little trick will serve you well in your hobbies. Volt-ohm meters are fantastic machines. Another trick: switch it over to test resistance (ohms) to test continuity of wires, and overall quality of remaining factory wires. You'll get a good feel for what the resistance should be on various gauges, and you'll know right off the bat when you see one with an unusually high resistance. O2 sensors, various thermometers, and wiring to various gauges will often deteriorate, especially near the coasts, and cause the Check Engine light to come on, fuel mixture to be unbalanced (in a car with a CPU), and you know what happens after you spend an arm and a leg replacing those sensors, gauges and thermostats? you pay your remaining arm and leg to a mechanic to run diagnostic tests, charge you for unnecessary overhauls, and pretty much royally screw you for the replacement of an 18 gauge wire that would have cost $2 at radioshack.

Posted on Jul 15, 2009

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I have the same car i think it was a problem with our blower/ac control, otherwise check that there is nothing plugged into the lighter socket, we have had problems with the trunk light staying on as well remove the bulb from the trunk and see if that is the cause...

Posted on Jul 15, 2009

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