HEELLLLLLLLLLLLLLLLPPPPP!!!!!!!!
Yesi had the same problem with my stereo. Kept burning them up. Your voltage regulator is bad. The voltage regulator is an internal component in the alternator by 1987. Easiest way to decipher this would be to get a volt meter, put the positive lead to the battery power on the back of the alternator, and ground the black lead. IStart the truck, and if your alternator is putting out more that 14.4 volts, you have an issue. you should check it at idle, as well as when you rev up the engine, as the faster it spins, the more energy it creates. If you are not comfortable doing this, you can also remove the alternator and have it tested at a local auto parts storethey can check it for you.
Fuses save circuits from shorts, if the bulbs are blowing out as opposed to the fuse or circuit breaker interrupting the power, then you may have a voltage regulator problem. Put a voltmeter across the headlight socket rev the engine, it should go no higher than 13.4 volts. If it does you need a voltage regulator. If not, check the ground connection. Good luck!
