Lonewolf1990 Posted January 7, 2022 Report Share Posted January 7, 2022 Just purchased a hot spark coil and I wanna install a new ballast resistor how do I wire a two prong resistor from the old 4 wire resistor Quote Link to comment
banzai510(hainz) Posted January 7, 2022 Report Share Posted January 7, 2022 (edited) i thought I awnsered this last night on another thread if this is a 3 ohm coil you find the ON wire which has 12volts ON key position to + side coil Find the START wire and put to + side coil Personally I would have keep the stock coil/ballast as is most likely Made in Japan. Most new stuff is all China Edited January 7, 2022 by banzai510(hainz) Quote Link to comment
Lonewolf1990 Posted January 7, 2022 Author Report Share Posted January 7, 2022 The stock one is strong enough for the upgraded coil? Quote Link to comment
Stoffregen Motorsports Posted January 7, 2022 Report Share Posted January 7, 2022 It's not a matter of strength. It's a matter of having the proper resistance to be compatible with the coil and whatever ignition module you are using. Quote Link to comment
datzenmike Posted January 7, 2022 Report Share Posted January 7, 2022 The points are the limiting factor in the stock system. They can only survive a finite amount of current flow. The arcing erodes the contact surfaces. Between 1.5 ohms (coil) and 1.5 ohms (ballast) totals about 3 ohms so the currant flow can be calculated (assuming a maximum 14 volts charge when running) as 4.666 amps. Starting would be bypassing the ballast and with only the 1.5 ohm coil.... 9.3 amps to give a higher output briefly while starting. Total watts used in the system is 65.33 / 2 = 32.66 watts each for coil and ballast. It would seem the stock 1.5 ohms ballast must be capable of dissipating 32.66 OR MORE watts of heat. New coil.... Cannot really have lower resistance or more current will flow not only shortening the life of the points but also over heating the ballast resister' wattage rating. A 'high performance' coil will have to be more efficiently wound and be made of better materials. The EI Matchbox distributor. Using transistors to switch the coil on and off and eliminating the points altogether there is no need for a ballast resister to limit voltage and current. Thus a coil can be built with a much lower .75 - 1.0 ohms. The current in a matchbox electronic ignition is simple to calculate as 14 to 18.66 amps assuming a 14 volt charging system. As you can see with over 14 amps as compared to the 4.66 amps of a points system, the matchbox will have a much higher output. Quote Link to comment
Lonewolf1990 Posted January 7, 2022 Author Report Share Posted January 7, 2022 Ok so I'm running the super stack coil that runs at 1.4ohms and I found a ballast resistor that is at 1.4 on Amazon but has to points Quote Link to comment
datzenmike Posted January 7, 2022 Report Share Posted January 7, 2022 What's the build date on the driver's door tag say?????? Do you have disc brakes on the front???? You have a '77 right? The '77 is a points distributor. 1.4 ohms is good enough to use with your stock points ballast no need to replace it. Quote Link to comment
banzai510(hainz) Posted January 7, 2022 Report Share Posted January 7, 2022 (edited) 7 hours ago, Lonewolf1990 said: Just purchased a hot spark coil Or is it Super stack or Super stockstock Accell ?????? these now made in China. The THe Big Yellow SUPERcoils are the good ones and hase a spare .7 ohm resisitor in the box. whats wrong with the old coil????? if you not converting to EI conversion as HotSpark or Pertronix modules and just useing the points in the distributor i wouldnt do anything. best improvement would be to convert to a point less ignition so you dont use the points. just changing to another coil is limited at best or Bad if you but the wrong one in there https://studylib.net/doc/18163198/troubleshooting-hot-spark-electronic-ignition-conversion-... Edited January 7, 2022 by banzai510(hainz) Quote Link to comment
Lonewolf1990 Posted January 8, 2022 Author Report Share Posted January 8, 2022 I'm using the super stack Quote Link to comment
banzai510(hainz) Posted January 8, 2022 Report Share Posted January 8, 2022 never heard of them Quote Link to comment
datzenmike Posted January 8, 2022 Report Share Posted January 8, 2022 6 hours ago, datzenmike said: What's the build date on the driver's door tag say?????? Do you have disc brakes on the front???? '78 was the first year the EI system was used outside of California and front disc brakes. Trucks with build dates from June '77 on, are '78 model years. So it's important to be sure you have a '77 model year. Another clue is do you have disc brakes? Quote Link to comment
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