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The Norfolk Broads Forum / Broads Boat Owners Q & A / Ignition Coil - Ballast Resistor ?
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Posted By Discussion Topic: Ignition Coil - Ballast Resistor ?

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Dobin
May-24-2010 @ 2:21 PM                           Permalink
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I am looking for a spare ignition coil to have as a spare on my Seamaster 27  fitted with a Ford 115E 1969 / 1970 Wortham Blake engine.
The question that I keep getting asked is "does your ignition have a ballast resistor?"
Does anyone know the answer as to how I can find out  -  The only markings that I can see on the coil  is 12V  HA12  45171 [could be slightly different as it is hard to see]  I have also been asked what type of distributor is it? but I can see no markings inside or outside.
I have a circuit diagram that shows one input to the coil going to the ignition switch and the other to the distribitor
Regards
Dobin

essexboy
May-24-2010 @ 3:14 PM                           Permalink
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If you could add a piccky I can idetify the distributor,
just the cap will do.

George Sims

16E
May-24-2010 @ 3:14 PM                           Permalink
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Somewhere in my dim and distant past I trained and qualified as a motor vehicle technician.  I always loved and worked with trucks and buses but you have do petrol engines as well.

Ballasted ignition was introduced to aid starting.  
When you crank the starter the voltage across the battery drops to 8 or 9 volts ( a starter is almost a short circuit in electrical terms).

A 12 volt coil may start to struggle with only 8 or 9 volts.  To get round this the manufacturers fitted lets say a 4 volt ballast resistor and an 8 volt coil in series (one after the other) giving a 12 volt system.  However when starting a feed direct from the start side of the ignition switch bypasses the resistor and the coil gets the 8 or 9 volts from the battery thus giving a strong spark.  When the engine is running the start switch is released and the coil is energised through the normal wiring  getting 12 volts ballasted down to 8 volts (ish).
Based on your description I reckon you have a 12 volt coil unballasted coil.  A ballasted system would have two wires to one terminal on the coil- normal feed and bypass feed.

Mal
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..Get on and do it!!  Adventure before Dementia.

Dobin
May-24-2010 @ 4:55 PM                           Permalink
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Hi essexboy

I have these two pictures taken from the Ford Industrial Engines Instruction Book that was supplied with the boat when it was new.
Can you identify the distributor from these?
Also is photo of the wiring diagram from the book - [ I have replaced the Dynamo / Generator with a Ignition Protected Alternator that I had to source from USA. ]
If required I can take a distributor photo later in the week.

Thanks for your help

Dobin



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Dobin
May-24-2010 @ 5:00 PM                           Permalink
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Hi essexboy

I have these two pictures taken from the Ford Industrial Engines Instruction Book that was supplied with the boat when it was new.
Can you identify the distributor from these?
Also is photo of the wiring diagram from the book - [ I have replaced the Dynamo / Generator with a Ignition Protected Alternator that I had to source from USA. ]



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Dobin
May-24-2010 @ 5:02 PM                           Permalink
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Hi essexboy

I have these two pictures taken from the Ford Industrial Engines Instruction Book that was supplied with the boat when it was new.
Can you identify the distributor from these?
Also is photo of the wiring diagram from the book - [ I have replaced the Dynamo / Generator with a Ignition Protected Alternator that I had to source from USA. ]

Thanks

Dobin


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CoolUncle
May-24-2010 @ 5:58 PM                           Permalink
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Could this be a Lucas HA12 coil that was fitted to a number of 1970's vehicles? Mini-Cooper, Morris Minor...

HA12 had no ballast.

Colin

This message was edited by CoolUncle on May-24-10 @ 7:03 PM

jaguar
May-24-2010 @ 6:12 PM                           Permalink
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indeed it does, mk1 cortina's, 1200 and 1500, looking at the engine pics.never knew a lucas coil to be ballasted. or fords own coil(motorcraft).the ballast resistors were usually fitted to vauxhalls,attached to the live terminal of the coil.stand to be corrected,but, definitely a lucas coil.pretty sure the 115E was the 1500 model with the 5 bearing crank(the 1200 only had 3 and was prone to main bearing failure.)


regards,Mike


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forum girly swot  25/9/2009, 6/11/2009 , 10/12/2009,8/1/2010 and 2/4/2010

This message was edited by jaguar on May-24-10 @ 7:42 PM

16E
May-24-2010 @ 7:00 PM                           Permalink
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I agree with Cool Uncle and Jaguar it is a Lucas part description.  I always associated Vauxhall with ballasted systems 9and silly bulb failure warning systems).

I think Ford recalled the 3 bearing engines and fitted 5 bearing units about 1967.

Mal
16E

..Get on and do it!!  Adventure before Dementia.

jaguar
May-24-2010 @ 7:09 PM                           Permalink
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the little grey cells are working tonite, vauxhall were fitted with DELCO-REMY, with the ballast resistor.any way have found a replacement coil  here, have sent question to seller and reply was;- the lucas sports coil dlb105 is a direct cross reference to the HA 12.cheers john.
hope this is of use.


regards,Mike


STINKIES UNITED.
chairman of cider lovers united

forum girly swot  25/9/2009, 6/11/2009 , 10/12/2009,8/1/2010 and 2/4/2010

This message was edited by jaguar on May-24-10 @ 8:11 PM

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