Classic Mustangs (Tech)Technical discussions about the Mustangs of yester-year.
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My box is getting power in but no power out to the coil. I've had it for 7 years...daily driver. Just wondering if I'm over due for a new one or if they should last longer. I replaced the coil last year.
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I'd say it's time for a new one since it doesn't work? For my racecars, I run them about 4 seasons and then sell them. I'm not sure which is harder on them, daily driver=more use/less load or racing=less use/more load. But I replace them at 4yrs so I don't have to worry about it dying during a race. I do keep a couple older ones that are still good as spares.
The gas pedal fits best right up against the firewall, so I figure it should be there as much as possile
Even transistors can burn out. Probably the problem is vibration has cracked some solder joints. If you can open the box and inspect the solder joints with a magnifying glass, look for little circles around the leads or lose parts. The circles are hard to see but are solder fractures. Try re soldering the board if possible and then replace it if it still doesn't work..
There is a YouTube video on these repairs.
They epoxy them so they don't fail due to broken solder joints as pointed out by bop11. The problem then becomes, the PCB becomes unserviceable (disposable). My guess is that either capacitor, resistor, or transistor popped.
Going to have to pony up and just buy a new one or contact MSD to see what they say.
MSD boxes are usually good for anywhere to 1 minute through twenty years, but experience shows failure rates in the first five years are pretty high. For a daily driver, it baffles me that folks spend the big bucks to install something that can't even compare service-wise to OEM ignition stuff.
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