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Old 12-09-2020, 01:52 PM   #1
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Join Date: Nov 2020
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Wiring harness question from noob

My tail lights, brake lights and turn signals on the tow vehicle work. I attached a 4 way trailer lighter tester to the tow vehicles harness. As stated the tail lights, running light, brake lights, and left turn signal are operable. The right turn signal is inoperable.

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Old 12-09-2020, 11:07 PM   #2
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1) Verify the tester, make sure the problem isn't there.
2) Check the trailer turn-signal-fuse in the power distribution box under the hood. The trailer light circuits are protected separate from the van's lights.

2000 E450 dually V10 wagon
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Old 12-10-2020, 07:46 AM   #3
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Originally Posted by carringb View Post
Verify the tester, make sure the problem isn't there.

If you have a multimeter check the connector with that; that will confirm the issue is on the vehicle and not the tester.
2008 E350 RB passenger 4WD SMB penthouse
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