It depends on the year of the 1200. They are called Igniters.
1984 resistance 1.1 to 1.3 kohm
1985 and up 330 ohm +- 23 ohm so 297 to 353 ohms.
On the 84 the igniters are on the back of the engine by the stator on the 85 and up they are under the timing belt cover.
Now when the igniters fail they usually do it in pairs and you have no spark. Also they will usually let you know they are failing but shutting down the engine when hot. Let it cool and it starts right up.
More likely you have a corroded/dirty connector either the 4 pin plug just forward of the batter, on 84 , or up next to the regulator, 85 and up.
Also check and clean the connectors to the right side coil. Make sure there is 12 v there and coil wires connectors are clean where they connect to the Ignition Control Module located just above and forward of the air cleaner.
New users please visit our "Shop Talk" for common tips and help:http://ngwclub.com/forum/page/ST
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71 CL350 with Bingham side car
2010 HD Ultraglide Classic Limited
2008 HD Dyna Low Rider
83 KZ1100L1 Shaft
83 KZ550LTD Shaft
Previous bikes: 84 GL1200 STD, 83 KZ550LTD, 83 CB1000, 78 CB400A, 82 CB900F, 79 CB750K, 2001 GL1800, 2000 Dyna Super Glide, 1972 CB350 K4, 1985 GL1200A, 1997 1200 Sportster, 84 GL1200I, 82 Honda CM400E, 81 Suzuki GS650L, 72 Triumph Bonneville 750, 72 Honda CB350, 66(?) Honda 305 Scrambler, 6? Yamaha yz250, 62 650 Matchless (Norton-Villers).