 Tach Kills Engine, When Tach is connected to coil, engine quites after running for 4 minutes? |
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| struckn |
 Dec 3 2011, 02:51 PM
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Senior Member  Group: Members Posts: 1,069 Joined: 9-November 11 From: South Central York Pennsyvania Member No.: 13,764 Region Association: MidAtlantic Region  |
This has me really confussed. I have Pertronixs in the dizzy and a MSD Blaster 2 Coil, Carb conversion from FI, '74 four. It runs great as long as the tach is disconnected at the coil. If I plug the tach into the negative coil terminal the engine will start, run normally and the tach works perfect at all RPM's. But after running only a few minutes the engine shuts down and will not restart unless I disconnect the tach wire from the coil. Any suggestions would be really appreciated, thanks.
Doug |
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| underthetire |
Dec 3 2011, 06:51 PM
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
Better double check then, the pertronics units I think need it to keep from overheating. The stock coils have it built in. Should be something on their website to measure the coil resistance to determin if it's needed or not.
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| struckn |
Dec 4 2011, 04:55 PM
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Senior Member Group: Members Posts: 1,069 Joined: 9-November 11 From: South Central York Pennsyvania Member No.: 13,764 Region Association: MidAtlantic Region |
QUOTE(underthetire @ Dec 3 2011, 04:51 PM)  Better double check then, the pertronics units I think need it to keep from overheating. The stock coils have it built in. Should be something on their website to measure the coil resistance to determin if it's needed or not. Thanks, I Ordered from Advance Auto a MSD .08 ohm Ballast Resistor. Should pick it up Tuesday and give it a try weather permitting. The MDS Blaster 2 Coil does not have an internal Ballast. It was on the car when I got it along with a MDS 5 Box and the Pertronix under the Dizzy Cap. So, According to what I've research the Ballast resistor isn't require if using the MSD 5 Unit, but I've disconnected the MSD 5 Unit and beleive it's defective. Car runs better with just the Pertronixs and the MSD Blaster Coil. I check the Pertronics instructions and it say if the coil is 1.5 Ohm use the resistor for normal applications, but not for racing. If the coil is 3.0 Ohms for normal applications remove the resistor. The MSD 2 Blaster coil is less then 1.5 Ohms so it won't hurt to try installing the Ballast Resistor to see if the engine runs OK, Then when ready I'll plug the tach back in to coil negative pole and see what happens. |
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Posts in this topic
struckn Tach Kills Engine Dec 3 2011, 02:51 PM
underthetire Do you have the ballast resistor on the msd coil? Dec 3 2011, 03:30 PM
struckn
Do you have the ballast resistor on the msd coil?... Dec 3 2011, 03:51 PM underthetire You can get them at radio shack btw, just a cerami... Dec 4 2011, 04:59 PM struckn
You can get them at radio shack btw, just a ceram... Dec 5 2011, 07:19 PM struckn Problem solved! Talked to Pertronix Tech and b... Dec 10 2011, 02:29 PM |
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