L-Side interior lights went out

[scottsdale1977]

I'm unfortunately throwing in the towel on my project, since Winter is approaching fast & my know-how/ability is not good enough to complete it in a timely manner..  just want to at least make sure I test everything before posting it for sale, the L-side (driver side) interior lights on my 77 Georgie Boy went out.  I replaced the 20A fuse on the fuse box, although the fuses have been sitting in the container for some years but they were new, still no luck.  I'll buy a fresh pack just in case, although I replaced the one for the R-side as well & they all still come on.   

The only other thing I can think of is when I pulled the roof vent off in the bathrooms, I had to disconnect some wires going to the fan/vanity light, but can't imagine they would specifically have to do with the all the interior lights on the left side.

[sasktrini]

Never assume.  The possibility is there.  At least it's only one circuit.  Wish you luck.

[PwrWgnWalt]

Those wires in the bathroom are likely the culprit. Not sure how yours is wired, but here's a general idea.
Think of the 12 volt DC electricity like a river... it flows through the fuse (probably either a black or red wire?), then out to the next spot the wire is uninsulated, which might be your fan/vanity light connection.  For the electricity to go any further, it has to have another wire to flow into (which then leads to your coach lights on the left side?), and so on until the river ends and you don't need the electrical run to go any further.
Then the 'water' (electricity) has to flow back to the starting point, probably via a white or black wire. It may also make the same stops at each connection, or it may use the chassis for the return path.
A DC voltmeter ( cheap or free coupon at Harbor Freight) is all you need to detect this current flow along the path. Start at the fuse, red voltmeter lead on the fuse blade/post, and the black voltmeter wire on the 12 volt DC ground (the chassis, or something conductive attached to it well)

[scottsdale1977]

Thank you, Walt!  One of the wires coming into the bathroom is a red one, as a matter of fact.  I have to make a run to the hardware store tomorrow anyways, so I'll pick one up & test/repost & see if I get anywheres.  Thanks again!   


-Mark