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What might be the problem if a 1997 Isuzu Trooper's low beams are out but the high beams still work?
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Answered 2009-12-19 11:31:35
Hi, there. This is exactly what happened to my '99 Trooper. Believe it or not, both the low beam filaments went out at the same time. I replaced on bulb and, bingo, low beams worked. Then, I replaced the other bulb and got the same result. Good luck. Hope this works for you.
-------- Hello, this is Lee adding a bit more to the answer.
Burned out bulbs suggest "high vehicle voltage levels".. High voltage levels are caused by a battery developing high internal resistance or a high resistance in the battery ground cable.
Automobiles typically use an alternator that charges the battery at a constant current. If the battery or the wire connecting the battery's negative terminal to the engine block develops a high resistance, then the voltage of the entire vehicle climbs a half a volt or maybe even a whole volt above normal. It turns out high intensity headlight bulbs quickly start blowing out when they are fed a little too much voltage.
So here is a checklist.
- Check the voltage drop for the battery to engine block ground connection. Check the battery connections. Remake as indicated.
- Does the battery need water? Not a very common problem these days, but small battery vehicles like motorcycles will develop a cell with low water.
- Is the vehicle battery at it's age limit? Aging car batteries sometimes develop higher internal resistance.
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