Electrical Problem, Clicking Sounds, and doesn't start??? - Ford Powerstroke Diesel Forum
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Old 09-25-2007, 07:51 AM
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Electrical Problem, Clicking Sounds, and doesn't start???

I have an 02 F250 7.3L and I have some kind of electrical problems that I don't know where to look next.

The there are several symptoms, but for example, when you put the key in the lights come on, but the radio doesn't work. Also when you trun the key to the run position, but don't trun it far enough to crank it there is a loud clicking noise coming for the left side of the engine compartment. When I try to crank the engine, there is a louder clicking noise behind the driver's side fire wall.

I am fixing to take it to the dealer to have it fixed, but I would like to know what could be the different causes of these problems.

I have already checked both batteries and they both have a charge of 12.4volts and there was some corrosioin on one of the battery post that I cleaned off, but this didn't make any difference in the problem.

Thanks for any input.
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Old 09-25-2007, 08:22 AM
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hey welcome to the .org!

Off hand your problem sounds like a bad relay somewhere, but thats just a guess. Does everything else function correctly once the truck is running?
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Old 09-25-2007, 12:51 PM
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I should note that I cannot get it started. I tried jumping it, but that didn't work. The second clicking sound, I think, comes from the starter, but I don't know for sure. There are also no dashboard indicator lights when I put the key in the ignition and turn it to the on position.
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Old 09-25-2007, 01:23 PM
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It sounds like there is a corroded connection in the system somewhere,,,....
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Old 09-25-2007, 01:26 PM
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possibility it is a multi function switch. They are about $100.00 at the dealership and it replaces your turn signal arm. As I have been told there are a ton of electrical things that go through the MFS so it can affect multiple items if it is bad. I would pm a tech to see if it might complicate starting.
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Old 09-25-2007, 02:18 PM
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Welcome to the Site! Hope your problem get fixed quickly.
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Old 09-25-2007, 02:27 PM
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Welcome to the Org.

You have 12.4volts, but what are the amps, maybe a bad ground, or bad cable going from the passenger side battery to the starter. The truck gets all its power from passenger side battery. I would check continuity from the battery to the starter to see if you have a lot of resistance. You mentioned you had to clean off corrission. Well that corrission can work its way down the battery cable which will cause heavy resistance and cause the truck to act like it has a dead battery. Another thing to check out would be the gem modual. As that does alot with your electronics and if the radio or other electric accessories are not working the gem may have took a crap.
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Old 10-02-2007, 07:00 AM
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Thanks for all of the information...

Everybody... Thanks for all of the information that was provided. As it turns out it was the batteries that were bad. I have replaced them and am back on the road again... Thanks again...
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