Your secondaries should measure in the thousands of ohms i.e. 6700 and 9600
using the figures you give. The BW primary is only slightly higher, it is
the secondary (assuming 6.7k) that is significantly so. Maybe that spec
results in a higher HT voltage without increasing (in fact slightly
reducing) the primary current. Never heard of a Borg Warner coil (thought
they made auto boxes) but unless you can take it back and swap it for one
you can find by testing that is closer to your original I would suck it and
see. For the record, the three specs I give are from coils I just happen to
have, rather than anythin definitive.
----- Original Message -----
From: "Patton Dickson" <firstname.lastname@example.org>
Sent: Saturday, March 23, 2002 3:11 PM
Subject: Coil Again - is this right?
> From the discussions last week, it was pointed out that I needed to check
> the resistance of the coil I bought at Pep Boys to see if this was the
> right coil for my 67 MGB or not. For reference it is a Borg Warner E40P.
> I dug the digital multi-meter out of the trunk of the Corvair and tested
> this coil. From the + to the - side of the coil the multi-meter read 3.8
> ohms. From either the + or - side to the output of the coil the
> multi-meter read 6.7 ohms. Does that mean:
> Primary resistance = 3.8
> Secondary resistance = 6.7
> From looking around on the web, it looks like I have a 12V coil, but the
> Primary Resistance seems high when compared to the coils on Paul's page,
> http://www.mgb-stuff.org.uk/ignition.htm and in Rick Astley's article on
> the The MG Cars Enthusiast's site,
> If I got the primary/secondary thing right, the dented Lucas coil that is
> in the car (it also has the screw on cap top which I want to change to
> in) reads
> Primary resistance = 3.0
> Secondary resistance = 9.6
> Can that secondary resistance be right?
> Do I need to take the Borg Warner E40P coil back to the store? If so,
> since the parts counter guys don't know what they are giving me, anyone
> have a car I can ask for a coil from so I will get the right thing?
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