I have a 1994 F250 that has completely went dead. It acted like the batteries was dead. I put the meter on it and both are at 12.46 volts. The cigarette lighter has power to it. But then I turn the ignition it goes. Also out and nothing no power to the instrument or the radio. It's as if there are are no batteries installed. I have check all the fuses in both boxes under hood and in the cab all are OK. Is there a fusible link to the starter? Or some other gizmo that would cause this total electrical break down? Also when I charge the batteries back up to 12.46 overnight they drain down to 9.6.
Charge both batteries outside of the truck and have them load tested. Most auto parts stores will do this for free. It sounds like they have enough current to run your cigarette lighter but the moment you turn on the truck, which on a diesel (assuming since 2 batteries), creates an enormous load due to the glow plugs attempting to engage. If the batteries are bad, replace them with ones specific to your truck. They will likely be larger batteries if your truck is a diesel.
For one it sounds like your batteries are bad. I’d check the battery connections as well but if your battery runs down to 9.6 over night after u charge it, it’s either a bad battery or you have a short, bad connection, or something draining your battery
you nailed it. brake system is causing the brake pedal to not release all the way. Possible vacuum leak somewhere.
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Check your voltage with power vehicle (place key to run.), If the batteries are draining down overnight it is time to replace BOTH Batteries. If one is failing it will draw down the other. if you have to charge battery more than once it is time to replace. Yes the price will grab you wing wang and make you squeak.
Testimonial: "Very helpful. One of the comments here gave me the hint that the glow plugs were draining the already weakened battery making the entire electrical systems completely fail. Thanks guys"
SOURCE: need under hood fuse box diagram for 1994 ford f150
Your radio fuse is not under the hood. It is in the dash panel on the left of the steering column. Y have to have two hots one constant for the memoty and one accessory that powers on the unit when your ignition is engaged. All you need is a test light to find the constant when the truck is off and the accessory that comes on with the key. There may also be an inline fuse in the dash that is blown. It would most likely be on the memory hotwire.
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Fuse box is on drivers side kick panel under dash.
It blends in very well due to being carpeted.
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Regulator in alternator obviously faulty, have it bench tested & fixed or replace alternator, and cure your problem.
SOURCE: radio, cigarette lighter, clock display went out
Under the hood there is some. Not sure about your application, but it might control interior stuff too. It will be a bigger amperage than normally inside the car though
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I've had similar problems with my cars, and everytime it was a bad ground or power wire, or corrosion on the terminals. Get a wire brush and clean both battery connecters..even a little corrosion can cause a no power situation. If you have a test light, connect the ground of the test light to the negative cable of the battery and touch light to the positive cable...if the test light doesn't light up, then you have a break or lose connection in your ground wire. Trace the battery ground to the engine block and clean that also...the smallest thing can interupt power...hope this helps..
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