Tracking down electrical short??? - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 06-25-2014, 09:59 AM Thread Starter
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Tracking down electrical short???

My Excursion keeps blowing fuse #17, exterior lights. It just started happening a few weeks ago on our way home one night. Driving along and my dash went dark. Luckily I did not get pulled over by the police as apparently the tail lights are also not working. Brake lights work but not tail lights.

I've replaced the fuse and it blew again. I have very little experience with electrical issues and saw that someone suggested checking with a volt meter. If the fuse is blown or keeps blowing, how can one check the circuit with the meter? And after I put in a new fuse, how do you check with the meter? Do you have to cut the wires to see if voltage is flowing?

I did find that one of the bulbs for the license plate was blown and the plug was pretty badly corroded. I doubht this is the issue though. Just not sure how to troubleshoot this. I hate electrical issues.

Zak
2000 Excursion 7.3L. 180,000 miles. Bone Stock (For Now)
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post #2 of 18 Old 06-25-2014, 10:08 AM
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honestly i would pull the taillights and look at the bulbs first

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post #3 of 18 Old 06-25-2014, 10:14 AM Thread Starter
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That's an easy first start. Thanks for all the help ZMann.

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post #4 of 18 Old 06-25-2014, 10:22 AM
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it's a start

they shouldn't cause the fuse to pop unless they are on and their is a path to ground from a bulb/or socket issue

another place to peak is the trailer wires even though the same applies as did to the rear lights

i have seen bulbs fail and short so even cab lights are suspect when trouble shooting

after that out comes the testers and the beer

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post #5 of 18 Old 06-25-2014, 10:33 AM
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I think that runs the fogs, door switch, and radio too.

Its not fun but its time to look for the short.

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Originally Posted by G8orFord View Post
My magic wand broke a few years back when my crystal ball fell on it. Ruined the ball too. So we're going to have to figure this one out another way. YOU NEED A MONITOR or at least a good scanner.
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post #6 of 18 Old 06-25-2014, 11:28 AM Thread Starter
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On my Excursion, fuse 17 is just the parking, tail and license plate lights as well as the dashboard (gauges, and lights for the radio/hvac). The radio, interior lights, etc all work. It was a bit creepy driving home at 2am when the dash lights went out.

I pulled the tail lights and the bulbs and wires looked good. A TON of sand/junk behind them so I cleaned out the area well. I removed the blown bulb for the license plate and covered the socket with electrical tape as the socket looks like it broke away from the mount. I replaced the fuse and the lights turned on, but I will keep searching for a break somewhere.

Zak
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post #7 of 18 Old 06-25-2014, 11:35 AM
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if you replaced the fuse and the lights came on what are you looking for ?

whats not working ?

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post #8 of 18 Old 06-25-2014, 11:37 AM Thread Starter
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Lights came on, but I'll have to drive it to see if that fuse blows again. I've replaced that fuse a few times already but just found the blown license plate bulb and removed it. We'll see if that keeps the fuse from blowing, but if not I'll have to start tracing the wires. But it's not something I've really done before and have not used my multimeter much.

Zak
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post #9 of 18 Old 06-25-2014, 11:40 AM
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i think it's that socket

fingers crossed

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post #10 of 18 Old 06-25-2014, 02:20 PM Thread Starter
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Another fuse blew. Now my two front power ports are not workikg nor my odbii port.

Zak
2000 Excursion 7.3L. 180,000 miles. Bone Stock (For Now)
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