This is really intended for someone who may be a new owner of a pre or just post war car. If you have mysterious power failures which come and go , particularly if the fuses are worked with, have a look to see that the fuses are a suitable length. At this time, fuses were a bit shorter than they are now and the newer fuses can be clipped in such that there is only metal contact at the one end. The correct length of fuse is still available new but old original ones can be pricey on ebay.
A fuse to watch out for of your car has a 3 brush dynamo is the field fuse for the dynamo. This is sometimes housed in the regulator box or in a separate unit on top of the dynamo. It should be 4.5 amps although I have to say I've resorted to 5 amp ones as they are the closest readily available. Again, the fuse holder is shorter than what is now normal and no contact here will result in no dynamo power.
Descriptive and in-depth articles on how to do repairs or restoration.
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