Posted By: cudabitten
Installed MSD 5520 now voltage flux with high RPM - 08/12/17 07:31 PM
Hi All,
I just installed the MSD StreetFire CDI Box in my 74 barracuda. Ignition was stock with black Mopar ecu 5 pin and dual ballast resistor. Alternator looks stock 2 field wires, one direct to battery, I bypassed the dash ammeter last year and installed an under dash voltmeter.
After the msd install, car starts right up, which was a big improvement, but above 1500-2000 rpm, lights flicker and voltage pulses from 13.5 to 15.5 approx. Pretty sure before I installed this box the voltage bounced around 12.5 to 13.5 but never made the lights pulse and never climbed up past 15.
I did a search here and found one solution that uses the diode that came with the MSD box, that did not work, tried it both directions.
I paid careful attention to the instructions and verified all wiring.
The culprit to me seems like the small red wire, it goes to the switched 12 v which was on the positive side of the coil, but it is also connected to the regulator and the field wires of the alternator.
Any ideas?
I just installed the MSD StreetFire CDI Box in my 74 barracuda. Ignition was stock with black Mopar ecu 5 pin and dual ballast resistor. Alternator looks stock 2 field wires, one direct to battery, I bypassed the dash ammeter last year and installed an under dash voltmeter.
After the msd install, car starts right up, which was a big improvement, but above 1500-2000 rpm, lights flicker and voltage pulses from 13.5 to 15.5 approx. Pretty sure before I installed this box the voltage bounced around 12.5 to 13.5 but never made the lights pulse and never climbed up past 15.
I did a search here and found one solution that uses the diode that came with the MSD box, that did not work, tried it both directions.
I paid careful attention to the instructions and verified all wiring.
The culprit to me seems like the small red wire, it goes to the switched 12 v which was on the positive side of the coil, but it is also connected to the regulator and the field wires of the alternator.
Any ideas?