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I have a lighting short on a 1978 F-100. Rear lights do not…

Customer Question
I have a lighting...

I have a lighting short on a 1978 F-100. Rear lights do not work. Rear h.arness is new. are there 2 wires that feed the taillights from from the firewall rearward

Mechanic's Assistant: Have you checked the bulbs? Have you checked the connection?

Yes

Mechanic's Assistant: What is the model of your '78 Ford?

F-100

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Replaced bulbs, sockets, plus one ground lead to the back if the vehicle

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Are there two ground wires feeding the wiring harness on this truck

Submitted: 11 days ago.Category: Ford
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Answered in 9 minutes by:
8/9/2018
Ford Mechanic: Mechanic01, ASE Certified Technician replied 11 days ago
Mechanic01
Mechanic01, ASE Certified Technician
Category: Ford
Satisfied Customers: 3,842
Experience: Owner at Baltic investments
Verified

Hello my name is ***** ***** welcome to just answers! I will be assisting you with all of your vehicle questions today. Please be aware I do not know your skill level or abilities so I will be asking a lot of questions and in a lot of cases we will respond to each other quite a lot before we find a solution. As far as phone calls are concerned you will receive a system automated call request, that is not me, and they do cost more money, I prefer text but in some cases a phone call is required. If I don’t answer right away or quickly in conversation I am helping another customer or have stepped out for a moment and will respond as soon as I can. Also I am not paid hourly by just answers, I am only paid when you rate me, so if you could please respect my time and knowledge by rating me when we are finished that would be wonderful. If you could please indicate your level of experience and what you are looking to get out of your session today. Ok lets get started!

Ive got a wiring diagram for that system, with it being that old there could be wiring repairs everywhere, you will just gave to trace to down from the source, do you have diagrams for that?

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Customer reply replied 11 days ago
we have changed the voltage regulator, the light switch, plus the previous items listed
Ford Mechanic: Mechanic01, ASE Certified Technician replied 11 days ago

changing parts isnt going to find the issue, your going to have to trace the problem down with a test light or multimeter

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