Elec woes, crank, no start after running then parked.
So measured all coils I got and all resistors.
There are no oem specs(of course) that I found for 1972(elec ign). But I compared my measurements to 1971 (points ign) as at least those are posted.
For 1971, Coil Primary Res is 1.65-1.79 ohms. 2ndary is 9200-10700 ohms
The ballast resistor for 71 is 0.5-0.6 ohms.
Now to my measurements...
CURRENTLY IN CAR
BR(unknown brand) 0.6 ohms but somewhat erratic(goes up)...gonna source a replacement.
Coil(unknown brand) 1.5 ohms primary, 8.82 2ndary.
Used Mopar Performance #4876732 Coil, 1.0 ohms primary, 4.57K ohms 2ndary.
Used SMP/BS 1.4 ohms primary, 9.13K 2ndary.
New SMP/BS 1.4 ohms primary, 9.14K 2ndary.
Spare ballast resistor 1.6 ohms...too high.
Now with all that rambling, the RU19 apparently specs at 0.5-0.6 ohms, once I can source one(or another at similar specs) I'll order one.
To me, the current coil(cold) is specing out fine. Very comparable to 1971 oem specs.
The only coil that doesn't compare to specs is the Mopar Performance #4876732...it's got slightly lower primary and 1/2 the 2ndary ohms...would that mean more "spark" so to speak??
Next trip I will make sure to take my kit. I think the ballast is getting hot and increasing the resistance to the point of drastically reducing voltage. Make sense?
Once I come across this crank but no start I'll measure the BR before it gets a chance to cool down and see what the resistance is.
Still open to suggestions/ideas....
Thanks all.
So measured all coils I got and all resistors.
There are no oem specs(of course) that I found for 1972(elec ign). But I compared my measurements to 1971 (points ign) as at least those are posted.
For 1971, Coil Primary Res is 1.65-1.79 ohms. 2ndary is 9200-10700 ohms
The ballast resistor for 71 is 0.5-0.6 ohms.
Now to my measurements...
CURRENTLY IN CAR
BR(unknown brand) 0.6 ohms but somewhat erratic(goes up)...gonna source a replacement.
Coil(unknown brand) 1.5 ohms primary, 8.82 2ndary.
Used Mopar Performance #4876732 Coil, 1.0 ohms primary, 4.57K ohms 2ndary.
Used SMP/BS 1.4 ohms primary, 9.13K 2ndary.
New SMP/BS 1.4 ohms primary, 9.14K 2ndary.
Spare ballast resistor 1.6 ohms...too high.
Now with all that rambling, the RU19 apparently specs at 0.5-0.6 ohms, once I can source one(or another at similar specs) I'll order one.
To me, the current coil(cold) is specing out fine. Very comparable to 1971 oem specs.
The only coil that doesn't compare to specs is the Mopar Performance #4876732...it's got slightly lower primary and 1/2 the 2ndary ohms...would that mean more "spark" so to speak??
Next trip I will make sure to take my kit. I think the ballast is getting hot and increasing the resistance to the point of drastically reducing voltage. Make sense?
Once I come across this crank but no start I'll measure the BR before it gets a chance to cool down and see what the resistance is.
Still open to suggestions/ideas....
Thanks all.