The voltage gauge on the dashboard reads about 10 volts,but sometimes shows 14 volts.this problem didnt occur until we had 25 degree weather.
Check and make sure no interior lights are on, the most common is the vanity lights in the visor drawing the battery down or the interior lights coming on at night from a defective switch inside one of the doors
SOURCE: it uses too much fuel. 2,6 liter per 10 km.
You need to replace the sensors,,Throttle PositioningSensor, OXYGEN sensors, Mass Air Flow. after which your truck will run nicer and use less fuel.
SOURCE: When accelerating alternator light comes on.
Possible loose or worn alternator belt. Check the condition of the belt. If it's worn, replace it. If it's just loose, tighten it up.
SOURCE: 1988 ford truck f-150 xlt lariat cant get current to fuel pump
Have you checked the 'inertia switch' which in the event of an accident shuts off the fuel supply to prevent a fire . It's usually located in the cab on pass. side. Some models have one reset button, some 2 which have to be pressed at the same time. If that's not it, here's how the power to the pump SHOULD work, you will have to follow the path to see where it stops. When you turn the key on it turns on the EEC power relay on, this relay then provides power to the PCM (power control module) and the control side of the fuel pump relay. Power for the fuel pump is supplied through a fuse link or high current fuse attached to the starter solenoid (battery side). From the fuse link or high current fuse current flows thru the fuel pump relay and inertia switch to the fuel pump. The fuel pump relay is controlled by the PCM. When the ignition switch is turned on the fuel pump will operate, if the switch is NOT turned to start position, the PCM will shut off the fuel pump off after 1 second. This is to avoid flooding the engine when it is not running, just key on. So check out to see if you have a fuse link or a high current fuse and if they are blown.
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