Dynamo field terminal.

[Mervin]

Has anyone replaced/renewed a C40 dynamo's field terminal assembly?
It's broken off on my dynamo. Replacements are available. Fortunately I had a spare dynamo which has been fitted. The field coil wires are crimped on and it's all riveted to the casing!

[Mervin]

Used a n.o.s. Lucas terminal kit. The hardest part was de-soldering the field coil wire from the broken spade terminal! They must have used some serious solder in Birmingham.

field1.jpg (109.97 KiB) Viewed 7213 times

field2.jpg (123.09 KiB) Viewed 7210 times

[myoldjalopy]

To answer your question, Mervyn, I have not had a problem with the F terminal, but I did have a D terminal that came loose, with only intermittent electrical contact and thus erratic charging. I fixed it by liberal use of an epoxy glue!

[Mervin]

It was self inflicted and, as described in my original post, had broken off at the change in width. Or, I broke it off trying to remove the field connection.

[Mervin]

I was very close to embarassing myself by asking about the output voltage when bench testing. It would only achieve around 13v. Jumper between F and D, voltmeter between D or F and body. Flashed +ve earth.
Used a cordless drill to spin it. That was my error, it wasn't spinning fast enough! Mains drill 16,17,18 volts achieved. Care taken to stay below 20v.