Re: ballast
[Re: dodgedude4x4]
#290026
04/16/09 11:22 PM
04/16/09 11:22 PM
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Joined: Dec 2003
Posts: 5,314 Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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I'm not sure where this info keeps coming from.
If you wire it as oer the instructions, you don't nee to remove the ballast.
6 months ago I installed an msd 6al using the instructions to the letter( I have done them in the past, and was curious if they had changed. No real changes)
It states quite clearly when using the instructions for the install. that the ballast can be left in the old coil positive wire. Then That wire is used as the signal on wire for the msd. NOT the main power for the msd(that comes from the battery positive) and no longer on the coil positive itself.(that is powered directly from the the msd box)
In fact, the instructions specified, that the on signal wire is quite sensitive, and it may be necessary to have a ballast resistor in that wire, because some older ignition switches would "leak" residule voltage which was enough to keep the msd on. Without the ballast the car might stay running with the key off(not a common problem, but could happen according to the instructions, this was a section I had not noticed in previous years.)
In any case, I've installed many msd 6 series per the instructions, and never had to remove the ballast from the car. It will not affect performance in anyway, with or without, since the msd get's it's power from the battery, and the coil from the MSD itself. The ballast is no longer in the ignition circuit by wiring it like this, and that is why it says in the instructions, that "A ballast is not used with msd".
There is no ballast between the msd and the coil, or the msd and the battery, and the old ballast only reduces the voltage on the "on" wire
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