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I need to find the correct wires to join from the loom to the trailer the diagram i have does not match the colours for instance there is no yellow how do i match the right ones up to the trailer

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Use a voltmeter and see which wires in the loom show power when (1) tail lights are on, (2) brake lights are on, (3) each turn signal is on, and (4) which shows continuity with vehicle ground/earth. Match these up with the appropriate wires in the trailer harness.
If your brake lights and turn signals are the same bulb on the towing vehicle, you're all set. If they are different bulbs, you'll need an adapter to get both brake lights and turn signals to work on the trailer.

Posted on Dec 24, 2016

Testimonial: "i do not have a volt metre had a test light which blew now i need to know what wire goes where as the plug in the loom has repeat wires and does not even have colour scheme and when i asked auto electricians said no they wire them in ford do not carry the wiring over 3 year old and every auto elecs charge absorbent fees and dont do the job when you need it so thanks for your advice any way"

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Your post:
Hi There.
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