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voltage= current x resistance. assumig the bulb maintains the same resistance, which lights do not (their resistance changes with their temperature), the current flowing through the bulb would decrease with an increase in voltage. while 14.9 volts is a little high (only about .5V with the engine running), it shouln't be enough to burn out bulbs. check the resistance between the ground wire of the bulb and the negative terminal of the battery (be sure the take the bulb out to isolate the ground circuit). if it's much more than .25 ohms, check all the connectors on that circuit and make sure they're clean. check for any shorts in the ground circuit. you can do this visually, or do voltage drop tests between several points in the circuit and the negative terminal of the battery. a short after the bulb could bypass an intended resistance and increase current flow through the bulb without blowing fuses. just a few suggestions. they might not be worth anything.
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