Wiriing around distributor, ignition coil & ballast resi - Rolls-Royce and Bentley Forums
 
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post #1 of 5 (permalink) Old 02-07-2012, 02:23 PM Thread Starter
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Location: Sydney, Australia
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Wiriing around distributor, ignition coil & ballast resi

Hi - can anyone explain, or does anyone have a simplified diagram showing how the wiring should run between the ignition coil, ballast resistor and the distributor.

Someone previously has taken the ballast resistor out of circuit, and removed all the wiring, so not sure how it should be wired back in.

This is for a Silver Shadow II.

RR Silver Shadow SRH40222
Sydney, Australia
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post #2 of 5 (permalink) Old 02-08-2012, 05:49 AM
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Well, it would be a stretch to call any wiring diagram for a Silver Shadow "simple"..., but they are available on-line.

In fact, our esteemed colleagues in your home country have the entire workshop manuals on-line:

http://rrtechnical.info/SY/TSD4200/tsd4200.htm

(You want Chapter M, Electrical System > Electrical Part 1 > probably page 44 -- careful though, as depending on your serial number and original market for the car, one of the supplements following that may apply.)

Cheers,
Jeff.
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post #3 of 5 (permalink) Old 12-23-2016, 11:01 AM
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Even though this thread is now ancient, and I've posted lots of material on this after my FTP that ended up being related to a failed Lucas Opus distributor module, I recently updated a diagram I made based upon recently received information.

The following applies to the two-series cars that use the Lucas 9BR ballast resistor block. Right-click on the thumbnail and do a "Save Link As" (or your browser's equivalent) to download the file to your computer for printing. It is utterly illegible even when expanded by clicking on the thumbnail, but prints out as an 8.5" x 11" page that's easy to read.

If anyone happens to be actively working with the ballast resistor that can get a good look at the wiring on the incoming connector so that I can confirm wire colors I would appreciate knowing what those are. I'd also love to know what the wire that comes in to connector A actually is. I have never found anything that's helped me nail down what this input is and where it comes from.
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File Type: jpg Lucas_9BR-47247A_with_Assumptions.jpg (129.7 KB, 15 views)

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
~ Niels Bohr



Last edited by guyslp; 12-23-2016 at 11:10 AM.
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post #4 of 5 (permalink) Old 12-24-2016, 02:35 PM
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Thanks for the info we will check and see if that is the problem
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post #5 of 5 (permalink) Old 12-30-2016, 09:02 AM
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Simple question, simple answer - the electrical flow is as follows:

Battery --> Switch --> Ballast Resistor --> Positive side of coil --> Negative side of coil --> Distributor.

Get the +/- coil-wires backward and car starts but won't accept a load as it backfires and mimics a bad coil (but may go vroom-vroom very nicely in park, or neutral). By the way, yes you can delete the ballast resister but then you need a coil specifically made to have no resistor in the circuit (common and dirt cheap - any parts counter and not specific to RR). FWIW, the way a ballast resister works is it lets the points have full voltage when starting (over 12V) but then reduces the voltage (below 9V) while the engine is running (for enhanced points longevity).

John Beech
Orlando, FL
(407) 302-3361
SRX6816

Last edited by jbeech; 12-30-2016 at 09:04 AM.
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