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Old 01-01-2010, 03:51 PM   #1
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installed lights and battery died overnight

one of my friends suggested it could be a bad switch i installed, i used a 15a switch to run 2 100w lights, could this be a reason my battery died?

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Old 01-01-2010, 04:32 PM   #2
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Did you wire them up with relays?

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Old 01-01-2010, 05:42 PM   #3
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If you just used the switch to control the main voltage to the lamps--that switch will not last long.. 200 Watts at 12 Volts is 16.666 amps.. Now if you used the switch to control relay switching -- it should be less than 2 amps normally--as the relay handles the load and not the switch. Always a general rule of thumb for electrical wiring is use hardware ( wiring, switches,etc) that is 25% above the load rating. If the lights where not on --I dont see why the battery would be dead--unless the switch failed during the nite and the lights came on drained the battery. Not sure what other circuit you may have tapped into draw the voltage from.
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Old 01-01-2010, 05:55 PM   #4
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If you used a relay and you wired the coil up to the battery so it's always energized except when the lights are on (ie wired the main load to the normally closed pin/wired it up backwards), it may have drained the battery that way...not sure how much of a drain the relay coil has on a car battery though.
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