Electrical maladies of this nature, I.E., low voltage DC, are always an earth issue.
Either there is no earth, there is an extra earth shorting the live to earth, or there is insufficient earth.. no other options are available! Even a blown bulb falls under earth fault - there being no complete circuit…
I would highly recommend watching some vids on the tube from South Main Auto Repair… Eric O is an excellent teacher and technical wizard, and it will be time well spent IMO.
plus, of course, ask on here… mists of us have been there, done it, and got the ****** t-shirt
Either there is no earth, there is an extra earth shorting the live to earth, or there is insufficient earth.. no other options are available! Even a blown bulb falls under earth fault - there being no complete circuit…
I would highly recommend watching some vids on the tube from South Main Auto Repair… Eric O is an excellent teacher and technical wizard, and it will be time well spent IMO.
plus, of course, ask on here… mists of us have been there, done it, and got the ****** t-shirt