In Reply to: 6 volt front mount coil posted by Barry on February 07, 2024 at 10:06:31:
6V or 12V setup? Don't be sure you have a coil issue yet. You can Static Test the Front Mount Coil with your VOM set OHMS. Place one probe on Pigtail of Coil, other lead on the top Terminal Post, polarity doesn't matter. 6V Coil should read abut 1.5 OHMS as shown. A 12V Coil should read approximately double that. You may have a 12V Coil but that's no problem. This isn't a 100% foolproof method to determine if the coil is good or bad though.
There's more to electrical circuit; starting/ignition/charging than looking at the coil. Bruce (VA) is the in-house electrical guru here and has all the info on wiring and testing each with excellent in-depth explanations for each. Copy and paste his info to your PC Folder for reference. FACT: 99.98% of all non-starting issues are due to incorrect wiring. Verify your system is wired correctly before trying any testing of circuit. Front Mount Distributor is the #1 most misunderstood feature on these older FORDS. A Tuneup must be done on your bench per manuals. Preliminary testing then performed before mounting unit on the engine. The DIST is mounted only one correct way but can be forced down 180 DEG off which will cause the base to bust at first power - see pix. If your unit looks like this, this is the case and the base needs to be replaced. Breaker Points are gapped at .015" and must be right - no hand grenades or horseshoe guessing, with no mis-aligned contacts. Some points sold today are junk and can't be gapped correctly. Best to use the STANDARD IGNTION/BLUE STREAK ones, p/n FD-6769X, NAPA usually sells them. Option #2 is the TISCO ATK6FF Set. ALL '39 - '50 FORDs used the front mount distributor. This also requires the use of the OEM BALLAST RESISTOR in the circuit as well, no exceptions. Use the WIRING PICTOGRAMS by JMOR for all correct ways to wire these.
COIL STATIC TEST:
WHAT HAPPENS WHEN - FRONT MOUNT DIST IS 180 DEG OFF:
OEM 6V WIRING PICTOGRAMS:">
FRONT MOUNT 12V WIRING PICTOGRAMS:
OEM BALLAST RESISTOR:
Tim Daley (MI)