03-02-2024, 01:42 PM
A pal of mine asked me to take a look at the wiring on his 1935 four-seat tourer this morning. He was concerned at some signs of heat damage to the loom - in particular the wire from the D terminal of the cutout to the ignition switch.
Sure enough, it transpired the entire length of that wire has burned - right through in places. He's a lucky chap his car didn't go up...
Having removed the dashboard I cannot see anything obvious by way of a short circuit. There are a couple of scorch marks on other wires but since the yellow wire from cutout to switch was sheathed in a piece of plastic sleeving I don't think yellow wire is the cause.
Further, the black wire from ignition switch to ignition light is untouched. It connects with the burned yellow wire at the switch of course. Also, the wire from the dynamo to the D terminal is untouched.
My question is - what could have cause the short/burning? Is it possible for the switch to short internally and cause this?
Any clues will be gratefully received!
20240203_114247.jpg (Size: 100.05 KB / Downloads: 502)
20240203_105423.jpg (Size: 143.24 KB / Downloads: 501)
20240203_113612.jpg (Size: 112.18 KB / Downloads: 502)
Sure enough, it transpired the entire length of that wire has burned - right through in places. He's a lucky chap his car didn't go up...
Having removed the dashboard I cannot see anything obvious by way of a short circuit. There are a couple of scorch marks on other wires but since the yellow wire from cutout to switch was sheathed in a piece of plastic sleeving I don't think yellow wire is the cause.
Further, the black wire from ignition switch to ignition light is untouched. It connects with the burned yellow wire at the switch of course. Also, the wire from the dynamo to the D terminal is untouched.
My question is - what could have cause the short/burning? Is it possible for the switch to short internally and cause this?
Any clues will be gratefully received!
20240203_114247.jpg (Size: 100.05 KB / Downloads: 502)
20240203_105423.jpg (Size: 143.24 KB / Downloads: 501)
20240203_113612.jpg (Size: 112.18 KB / Downloads: 502)