OK, now I'm losing my mind. Several times I checked the pin at the plug behind the engine and was getting 6.5V. I was just about to button up the wiring and decided to check again and now its reading 12.5V. What gives
Duraspark II with ram air debacle
- Thread starter 351mach1
- Start date
Help Support 7173Mustangs.com:
- Joined
- Jan 24, 2012
- Messages
- 4,584
- Reaction score
- 1,447
- Location
- Tucson, AZ
- My Car
- No Mustangs at the moment.
Under what conditions were you checking? Engine on or off? If off, you'll see full battery voltage with points open and about 6V with it closed. With the engine running, you should see something like 1V below battery voltage, which is the average voltage with points being opened and closed rapidly. Your meter may read something different (due to its averaging a variable voltage over time) but something well above 6V and somewhere below full battery voltage.
Just verified:
Engine off, duraspark and coil completely disconnected, and reading directly at the engine wiring harness, I am reading 12.5 volts.
My distributor doesn't have points.
Engine off, duraspark and coil completely disconnected, and reading directly at the engine wiring harness, I am reading 12.5 volts.
My distributor doesn't have points.
mach1sc
Member
Karl Kustoms sells a magnetic pickup distributor for 50$ I have been using it for 6 months now and it has preformed great. Model KPPJM6606 search google with that # and it will come up. I am using it with Duraspark type setup.
- Joined
- Jan 24, 2012
- Messages
- 4,584
- Reaction score
- 1,447
- Location
- Tucson, AZ
- My Car
- No Mustangs at the moment.
Good. That's what you should be reading.
How would I verify that the resistance wire in the harness exists and is giving the correct voltage as to not burn out the coil? I thought I should be reading 6.5V from the engine harness.
- Joined
- Jul 12, 2010
- Messages
- 5,435
- Reaction score
- 3,709
- Location
- Killingworth, CT
- My Car
- 71 Mach 1
71 XR-7 hardtop
71 Country Squire
65 hardtop
The voltage reading will change depending on whether or not the coil is charging, as the draw will reduce the voltage. 12.5V with the DuraSpark disconnected and 6.5V with it connected is what I'd expect to see.
- Joined
- Aug 28, 2011
- Messages
- 772
- Reaction score
- 158
- Location
- Spirit Lake, Id
- My Car
- 1971 Boss 351, 1969 Fairlane 500 Conv., 1965 Sunbeam Tiger
With the coil disconnected, you don't have a complete circuit, so are reading voltage potential (battery voltage). Measure with the circuit complete and go by MIdlife's earlier post. As for verifying if the resistance wire is present, since you read 6.5 volts at one point, it's there. If you really want to dig deep, you could find both ends under the dash and do an ohm reading. A standard wire will show 0 ohms, and the resistance wire will show something, although I don't remember how much.
Last edited:
Similar threads
