Finding switched 12 volt source
There is no fuse protection on the ignition. This seems to be the norm.
Now what I have just done does put the heavy red power supply for the MSD on the protected side of the fusible link.
Two caveats:
1. I don't know if the way I have done this will result in the MSD seeing more electrical noise, and if so, how well the MSD's electronics will tolerate that.
2. My decision to do this had several reasons which were important to me and arguable particular to the car and its current state.
- It might be an advantage having the MSD draw power from closer to the alternator.
- I was adding a parallel alternator output wire anyway. The R6 wire connection at the bulkhead is not in top condition - hasn't been for a couple years.
- The ammeter will now read only battery charging and discharging. This is generally minor. At most the the MSD draws 1 amp per 1000 rpm.
I'm doing this now because the instrument panel is out.
There is no fuse protection on the ignition. This seems to be the norm.
Now what I have just done does put the heavy red power supply for the MSD on the protected side of the fusible link.
Two caveats:
1. I don't know if the way I have done this will result in the MSD seeing more electrical noise, and if so, how well the MSD's electronics will tolerate that.
2. My decision to do this had several reasons which were important to me and arguable particular to the car and its current state.
- It might be an advantage having the MSD draw power from closer to the alternator.
- I was adding a parallel alternator output wire anyway. The R6 wire connection at the bulkhead is not in top condition - hasn't been for a couple years.
- The ammeter will now read only battery charging and discharging. This is generally minor. At most the the MSD draws 1 amp per 1000 rpm.
I'm doing this now because the instrument panel is out.
