Posted by Brad Gyde on February 03, 2012 at 23:05:47 from (50.36.125.144):
Ok, so I got a truck that has what I believe to be a short somewhere in the rear lighting system.
Shortly after I bought the truck, it had this very problem, so i rewired the bed (has a flatbed w/ lights in headache rack) and corrected what I believe to have been the cause of why the wires rubbed and shorted.
Fast forward a few years, and the problem seems to have resurfaced, so naturally, I have visibly checked for bare wires and bad connections.. Can't seem to find any.
Why do I believe I have a brake light short? Well, because the "plug" on my brake switch has now melted, and it has popped a fuse. If I stay on the brake long, I can smell the wire getting way too warm. I have a good idea as to which is my problem, however I can not visibly see a problem.. (but it seemed to start shortly after a repair was made, so I'm thinking something in that repair is the problem)
I believe a "amp clamp" would probably help my diagnosing, but I don't have one, nor the money to invest in one this second.. What I do have is time, and a lot of "assorted items" in my shop..
My thought was to use a ammeter to try to "isolate" my problem area.. If I were to add a couple "leads" and probe connections, it should show what part of my circuit is drawing the larger amps, right?? (yes, I have a way of "isolating" all the lights from one another at a junction box like would be used on a semi-trailer)
So, would my thought of using a everyday old ammeter work to show me what light was doing the heavy draw? (I don't see why it wouldn't, so thats why I am asking for opinions.. Hate to spend time trying it to find out it will not help)
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