A diode only lets current to run in one direction. When they go bad then current can be drawn back threw that circuit. Replace the diode.
The diode can be tested with an ohm meter. It should have continuity in one direction, but not the other. It will need to be removed from the circuit to be tested.
1996 Ford F-150
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Maintenance & Repair
I have a 1996 Ford f150 5.0 the other day the temp gauge went from cold to hot then back to cold the hot again I knew the thermostat was stuck open so I took it had it changed, new water pump, new...
1996 Ford F-150 XL Extended Cab SB
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Maintenance & Repair
Truck has been losing power, we replaced her alternator and battery, but she keeps sucking power out. she will start for a few hours and then her dashboard and my lights will all good out. she will ...
1994 Ford F-150
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Maintenance & Repair
Trying to put this 1996 ford lareit motor in this 2001ford f150
2001 Ford F-150 Lariat Extended Cab SB
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Maintenance & Repair
My power windows all stopped working at the same time, I replaced the main switch on the drivers side and still nothing. I checked all of the motors by hooking up a battery and they work just fine...
2006 Ford F-150 FX4 SuperCab Styleside 4WD
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Maintenance & Repair
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