MSD Digital 6AL pn 6425

[Nantucket427]

If you are a member of the Superformance Group you can pick up a technical bulletin posted to that site about MSD boxes the fix and instal

[Voyager]

Originally Posted by Nantucket427

If you are a member of the Superformance Group you can pick up a technical bulletin posted to that site about MSD boxes the fix and instal

For the 7 years I've owned this cobra - have been a member of that group on and off a couple times. Not currently a member...

Have great confidence in the knowledge base resident on this site.

Bob

[Eric 1151]

My amp gauge is rock steady. For the gauge to bounce that much, the amp draw is changing, probably from the MSD box. The brain trust on SCOF recommends the Crane unit. I won't even consider anything else.
Eric

[Voyager]

I hate electricity!

Could the bouncing gage be a result of loose connection?

Don’t mind buying new box (Crane), but all the other related components are MSD (not sure that matters) and I just paid $475 for installation (cause I was stumped by the tac hookup and my back doesn't play well upside down in the passenger foot well).

Wonder if the crane will plug & play into current wiring setup or will it require additional wiring?

[Blas]

Most MSD problems are related to wiring in one way or another. Improper grounding and incorrect power supply sources are the usual culprits. Coils mounted in the incorrect orientation or too close to hot exhaust headers or in high vibration areas are common issues. A power surge will kill them too. If you don't believe that, just switch off your master kill switch with the car running a few times. MSD is the system we show on the MKIII Wiring Diagrams we sell. A quick way to test the system is to disconnect the main MSD power supply from the car and temporarily power it from a remote battery. See if the bouncing amp meter goes away. Check that your wires going to the distributor from the MSD are not too close to a spark plug wire or taped together with any other wiring. Yes, the SCOF site has a fix for a jumpy amp gauge. But I would think you would be interested to know why it started jumping after the addition of the MSD box. It didn't before, and most cars have no problem. Why yours then?

[Voyager]

Originally Posted by Blas

Most MSD problems are related to wiring in one way or another. Improper grounding and incorrect power supply sources are the usual culprits. Coils mounted in the incorrect orientation or too close to hot exhaust headers or in high vibration areas are common issues. A power surge will kill them too. If you don't believe that, just switch off your master kill switch with the car running a few times. MSD is the system we show on the MKIII Wiring Diagrams we sell. A quick way to test the system is to disconnect the main MSD power supply from the car and temporarily power it from a remote battery. See if the bouncing amp meter goes away. Check that your wires going to the distributor from the MSD are not too close to a spark plug wire or taped together with any other wiring. Yes, the SCOF site has a fix for a jumpy amp gauge. But I would think you would be interested to know why it started jumping after the addition of the MSD box. It didn't before, and most cars have no problem. Why yours then?

Will review wiring this weekend. Recall seeing the tech’s wiring work being tightly zip-tied to preexisting wiring trails.

Damn! You have a wiring diagram! You told me that years ago. Doh. Will send you a note this weekend.