When I purchased my 13/60 and had to drive it part of the way home in the dark, the ignition light flickered, got brighter and then went out. Good I thought, the Problem has sorted itself out. But the battery was drained so this was not the case.
Upon Investigation, I discovered that the set up was deliberately made to positive earth - deliberatly because the battery terminals are normally not interchangeable.
The wonderful Workshop Manual is a bit vague on which control box should be fitted - mine Looks like a Lucas RB106. But is it possible that before someone changed the polarity to suit the control box from another car which was positive earth? That to me is the only Explanation.
Should a 13/60 be equipped with a RB340 like a Vitesse? I am reluctant to run the car up again before all the oils have been changed, Brakes etc have been checked because if this has been bodged, then probably something else as well; so I have not yet been able to do the voltage checks. I have already reconnected the battery to be negative earth though and polarised the Dynamo.
Any other checks needed?
Gott hüte mich vorm Sturm und Wind, und Autos ,die aus England sind
A long time ago ,when I owned a Herald for a short time I changed the polarity so I could run a modern radio. All I did was repolarise the generator, no problems with anything else. Sounds like your generator is at fault. Originally your car would have been positive earth. Only alternator equipped cars were negative earth. (I think) Tony.
If all else fails-Read the Instructions! ��Wairoa New Zealand
1976 2500TC (converted to S spec) owned since 1998.
In their day both were rated at 22 amp for dynamo operation the 106 being early 2 coil design with screw adjusters the 340 is later 3 coil with cams to regulate
Aftermarket indian copies have a poor reputation Pete
1964 1600 Vitesse 6 Cactus and Black , now sold now have T2000 Mk2 saloon in French Blue/grey trim been restored without running since 1997 now has power steering ,poly bushed and Alfa 156 seats location Luton
If it helps any, the original Lucas part number was 37290F for the RB-106-2 control box.
*Mrs Irrelevant: Oh, is it a jet? *Man: Well, no ... It's not so much of a jet, it's more your, er, Triumph Herald engine with wings. -- Cut-price Airlines Sketch, Monty Python's Flying Circus (22) http://triumph-herald.us