Expedition completely shut off, loss of power.

FordGirl1983 · Feb 13, 2016

We're currently researching and troubleshooting from yesterday's issue with my expedition, 99 5.4... Question what causes the power to completely shut off? Does the solenoid can short out, ground out? Can a relay or a fuse blow to make the guages stick (frozen at 50 on the odometer and the rpm stuck at 1000), other needles is down (gas, oil, battery, temp) will attach photo. We was on the highway when it happened, luckily we pulled over. It's most likely is a electrical issue. No power, no lights, no crank, just zippo! The battery seems to be good. Battery is currently disconnected. It was sparking at the battery terminal when trying to connect like it has a short somewhere. Any other information is appreciated, thank you.

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stamp11127 · Feb 13, 2016

A little spark is normal but a large spark isn't. What type of electrical knowledge and tools do you have?

FordGirl1983 · Feb 13, 2016

stamp11127 said:
A little spark is normal but a large spark isn't. What type of electrical knowledge and tools do you have?

We have the well known tools like the multimeter. We tested between negative battery terminal and engine block including frame. Getting 12.4 vaults. Seems like it's grounding out.

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stamp11127 · Feb 13, 2016

There is a constant draw on the battery for the memory circuits. If you can measure amps I would do that next but place a 7.5amp fuse in series with the meter.

stamp11127 · Feb 13, 2016

Check the positive battery cable, it may short on the Ac line.

FordGirl1983 · Feb 13, 2016

Ok will look into that. Oh and thanks for closing the thread under the Gen 1 category. I've originally posted here in the Electrical category, I guess I was right the first time lol.

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stamp11127 · Feb 13, 2016

You will normally see abut a 100-200 mA draw once the modules power down. Anything above that to 1A means something is on, above 5A I start thinking multiple circuits are on or short. If a maxi fuse pops without engine start attempt - definitely a short.

FordGirl1983 · Feb 13, 2016

stamp11127 said:
You will normally see abut a 100-200 mA draw once the modules power down. Anything above that to 1A means something is on, above 5A I start thinking multiple circuits are on or short. If a maxi fuse pops without engine start attempt - definitely a short.

Update, I think we found the problem. He said that the battery terminal or starter wire something like that connected on the starter has somehow seized, touched the engine block that caused the shortage. Still not out of woods yet but the repairs will be done soon this weekend.

Just to be sure, is the starter wire is 2 or 4 guage? It's a 99 5.4 Eddie Bauer.

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stamp11127 · Feb 13, 2016

Don't know off hand but bigger is usually better.

FordGirl1983 · Feb 13, 2016

No problem. Thanks so much!

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Expedition completely shut off, loss of power.

FordGirl1983

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