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Comet electrics

Russell Icke

Well Known and Active Website User
VOC Member
Hooked a new 6 volt battery up to the comet but no idea which wire goes to positive or negative. Hook it up one way and lights work with ammeter needle sitting high then when I switch switch connections lights still work and ammeter sits just below Half way which seems more normal. Any ideas?
 

Martyn Goodwin

Well Known and Active Website User
VOC Member
You will soon find out when you start the motor.

If its connected according to the factory wire diagram it will be positive earth so the positive terminal is connected to the frame.

NO NO I made a mistake - It is the NEGATIVE terminal that's the earth and connected to the frame.

Get it wrong and the battery will quickly overheat then die in a spectacular manner when you start the motor.

I suggest you find a chum with a multimeter and make sure BEFORE you start the motor.
 
Last edited:

TouringComet

Well Known and Active Website User
VOC Member
VOC Forum Administrator
VOC Forum Moderator
Positive earth? Are you sure? My Vins are all Negative earth, always thought Neg earth was factory.
 

Martyn Goodwin

Well Known and Active Website User
VOC Member
You are correct - my mistake. Sorry. Original wiring diagram attached. I have corrected my earlier post
 

Attachments

  • wire diagram ORIGINAL 001.pdf
    42 KB · Views: 27

Albervin

Well Known and Active Website User
VOC Member
In the 1950s one had to be very careful playing with electrickery. My old 1953 car was +ve earth. I am guessing there was a steady supply of Lucas smoke then.
 

oexing

Well Known and Active Website User
VOC Member
Our 1964 3.8 E-Type is still positive earth, 12 V dc dynamo, like it ever was. So not easy with a modern radio and its negative earth case. Had some smoke when I connected the earthed aerial for a moment. So no earth for the aerial and its radio then -and no great working radio in consequence with a lot of electrical noise. But then, this car is very noisy inside anyway and in times we just have the music cassette playing our own collection whenever we feel so.

Vic

P1010796.JPG

P1010772.JPG
 

mercurycrest

Well Known and Active Website User
VOC Member
Actually, only the prototype Vincents were Negative Ground. The final product, Series D Vincents, were Positive Ground! :cool:
 

Marcus Bowden

VOC Hon. Overseas Representative
VOC Member
SO "A's" "B's" & "C's were prototypes were they, I can understand the "A's" were as they are such a fascination of an abortion and totally different to work on, engine-wise as the parts of the cycle are all virtually the same.
bananaman.
 

Desmond

Website User
VOC Member
Hooked a new 6 volt battery up to the comet but no idea which wire goes to positive or negative. Hook it up one way and lights work with ammeter needle sitting high then when I switch switch connections lights still work and ammeter sits just below Half way which seems more normal. Any ideas?
 

Desmond

Website User
VOC Member
They were Negative earth as standard but there are now many new voltage reuulators available and some of them require Positive earth as I have just found out with my '51 Comet.
 

Andy H

Website User
VOC Member
Original neg earth which is ideal if you hook up satnav or phone charger when touring. I know most gadgets work off 12v but my Garmin adapter seems happy with 6v on my Rapide and took me to Italy and back . I have now spoiled it by a rewound dynamo for 12v. However recently bought Comet which has pos earth with solid stare regulator and that was 12v. Has lucas dynamo but probably 6v one . I have converted back to neg earth as wiring loom was a birds nest anyway. How do i tell if lucas dynamo 6 or 12v ? Probably academic now as gone all led.
 

Martyn Goodwin

Well Known and Active Website User
VOC Member
Original neg earth which is ideal if you hook up satnav or phone charger when touring. I know most gadgets work off 12v but my Garmin adapter seems happy with 6v on my Rapide and took me to Italy and back . I have now spoiled it by a rewound dynamo for 12v. However recently bought Comet which has pos earth with solid stare regulator and that was 12v. Has lucas dynamo but probably 6v one . I have converted back to neg earth as wiring loom was a birds nest anyway. How do i tell if lucas dynamo 6 or 12v ? Probably academic now as gone all led.
The original dynamo, intended as 6 volt actually produces over 20 volts - its the voltage regulator that makes ties the output to 6V.

The difference between a purpose made 6 and 12 volt dynamo is in in the gauge of wire and the number of turns of same on the armature. When rewound for 12 Volts the dynamo needs to spin faster to produce the same volts (but possibly at higher amps).

Having gone full LED and a 12V regulator, it matters not if the dynamo is 6 voly or a 12 volt conversion as the current required (amps) is miniscule compared to incandescent. Its the regulator that controls the plot!
 

poor1

Well Known and Active Website User
VOC Member
Martin. You suggest checking with a multimeter before starting the engine. How exactly would you know whether it was negative or positive earth?
 

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