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Old 08-16-2008, 07:50 AM
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MSD ignition box repair

Here is a shot of my MSD 6A. As You can see the 2 resistors are blown. MSD has refused to fix this even though this box has never been used. (out of warantee) I even offered to pay for the repair but they said they don't do this.

I forgot to take a picture of the whole board but this is at the end where the wires come out.

I can do this kind of soldering but I'm not real sure of the value of the resistors. ie what to ask for when I go to get them. Allied electronics and Radio shack may have them.

Somewhere I saw a post where a guy had done this or a similar repair but I couldn't find it here with search..

what do y'all think??
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Old 08-16-2008, 07:59 AM
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as best that I can tell those resistors are 19k ohms

and look to be about 1 amp units.

I would go for it, what can it hurt?
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Old 08-16-2008, 08:46 AM
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I'll try and hit Radio shack today for these.

Thanks for the reply.
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Old 08-16-2008, 03:20 PM
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You had best look at their website - they, according to the site most certainly will do out of warranty repairs. They also have an on-line RMA section - but it isn't free for those repairs. I wouldn't try a fix - something caused those resistors to blow. From their site:

"Service

In case of malfunction, your MSD component will be repaired free of charges according to the terms of the warranty. When returning MSD components for warranty service, Proof of Purchase must be supplied for warranty verification. After the warranty period has expired, repair service is charged based on a minimum and maximum charge rate. (Contact Customer Service for current rate)"

Another repair service - Tech West: http://www.techwestracing.com/

Dave W
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Old 08-17-2008, 12:09 AM
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I sent this unit in for warantee as it had never been used. They replied that it could not be repaired. I even offered to pay for the repairs...not knowing at the time what was wrong. They said that the board was toast. I see nothing wrong what so ever with the board except these 2 resistors.

This unit was installed exactly per their instructions. I even called with a question about the magnetic pickup distributor. An MSD unit.
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Old 08-17-2008, 12:55 AM
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I've done electronics repairs for years. I personally think I would be hard pressed to repair that board. I would just get another box, but BEFORE hooking it up, correct any wiring errors you might have.

My .02, even for myself I would just get another box. I really hate walking.
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Old 08-17-2008, 07:39 AM
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Quote:
Originally Posted by bluesman2333
I've done electronics repairs for years. I personally think I would be hard pressed to repair that board. I would just get another box, but BEFORE hooking it up, correct any wiring errors you might have.

My .02, even for myself I would just get another box. I really hate walking.
I agree, the board is burnt and you dont know what other components are blown. Resistors dont fail on their own. Something else is shorted. Once a board burns it is going to be problems, they really cant be fixed for reliable usage.

Chet
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Old 08-18-2008, 06:43 AM
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I would buy a mallory box as they are offering a bounty on msd boxes turn your box in with proof of purchase and get cash in return.
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Old 08-18-2008, 02:58 PM
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I agree on the Mallory & Crane boxes, top notch. MSD=Must Service Defective. MSD=May Shut Down I've had nothing but bad luck with, after the 3rd MSD box I gave up. 6yr old Mallory box still going strong. 8yr old Holley Strip Annihlator no problems.
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Old 08-19-2008, 08:48 AM
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This raises the question - will either the Mallory (Mr Gasket!!) or Crane boxes work with my MSD 8479 Pro Billet small diameter distributor?

Any experience?

After being inside of the dist. to change springs, there really doesn't seem to be much more of an electronic pickup then a standard Ford, and with the major difference being a GM appearing top mounted advance plate.

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Old 08-19-2008, 02:56 PM
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sure will a magnetic pickup is a magnetic pickup. Msd pickup coils are Ford any way.
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Old 06-08-2016, 09:41 AM
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I had the EXACT same incident. Hooked up battery wires wrong,fried resistors, found schematic online, got repaired for cost of resistors. How can a box FRY resistors without EVER being used, as according to op?
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Old 06-08-2016, 12:07 PM
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It causes me concern that an MSD box has to have direct positive and ground connections to the battery.
I prefer everything dead when I turn off the ignition.
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Old 06-08-2016, 01:49 PM
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Old post but now it brought up...
The electronics burn out due to the amp spikes of the ignition switch. Wire it they way they say and it'll work just fine. If you weld on the car, disconnect it.
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Old 06-08-2016, 06:34 PM
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I could see that if this was a micro circuit but the box takes an amp per thousand rpm and supposedly capable of more than 8000 rpm so it should handle 8 amps.

Turning the cut off switch is the same as disconnecting the battery, so it disconnectis the MSD.

They tell you not to use a battery charger with the box connected so you have to disconnect the unit to charge the battery.

If I don't drive the car for two weeks and don't cut off the battery the voltage will be too low to start the car.

An HEI will fire on the last gasp of battery, why can't this hot shot, pricey aftermarket thing do the same?

Next question, why is it that a back yard hotrodder (no offense) can dig out some potting and solder in a couple of resistors and repair his unit and MSD cannot or won't?

Right now if a Vertex magneto had a vacuum advance, I'd have one and install it.
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