I was checking for leaks and noticed the rubber screen trim was not as tight onto the scuttle in the middle as towards the sides. Probably a mis-match in the curvatures of the scuttle and screen frame. Hand made tolerances! Whilst cleaning in readiness to put some sealer under the rubber I spotted a wire under the screen frame rubber. It had been stuck there during screen fitting probably from new. A prime situation to cause a wire failure/short. I wasn’t having any problems with the screen heater. I teased it back out of the way.
So if you have a multimeter do the sequence of checks above to try to narrow down the cause. It could mean the difference between £1000 ish for a new screen or a few pence for a poor connection. Electrics can be a right pain to troubleshoot, especially on a Morgan with less than brilliant wiring diagrams.
There are cheap multimeters that can do a decent job on basic circuit testing so no need to go up market. Remember the days of making up a tester from a bulb and wires for testing for current? A battery in series to check continuity.
Last edited by sospan; 19/05/20 10:00 AM.
