SPF Electricals -

Goopie 18 · #1 (**permalink**) 12-22-2008, 05:55 AM

CJ428CJ and Blas seem to be correct. After correcting fan rotation and a 50 mile test drive, the fuse did not blow! I'll keep an eye on it but it looks like I'm good to go. Thanks guys!

Blas · #2 (**permalink**) 12-22-2008, 07:42 AM

Dan..
The newer tachs do not need a tach adapter. Yours is the newest style based on your car number. I remember reading about a problem someone had similar to this once before. I'm sure the the MSD tech people can help you out on this one, or Dennis Olthoff. Is this a Roush engine? they would also be a good resource. Check the easy items I mentioned and then follow up with these resources. And remember to post what you've learned here on CC. Just to be sure here, your tach signal to the MSD is coming from the "black/white" wiring on the back of the tach loom right? You have a small "red" power supply going to the ignition switch. Then the big "red" and the big "black' as mentioned earlier.

T E Lewis · #3 (**permalink**) 12-22-2008, 11:36 AM

Don,

Take the tach out, the plug that goes into the back of it should be a six prong unit. Take the wire from the #3 position, move to the #4 position, do not reconnect #4 to anything and leave #3 blank This will make it pick up the correct pulse from the MSD. You will probably find that the wire coming out of the #4 spot currently goes to nothing, and is just a short stub in the wiring harness. This will cure your problem.

Thom