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48 ford 226h 6volt coil resistor

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Morning, my 48 ford f1 226h positive ground is giving me electrical issues.2 sets of points,2 new oreillys 6v coils have been installed last 1000 miles.Truck has new wires,cap,rotor,plugs,newly rebuilt.Started to lose power under losd,missing,bucking,like out of gas,it's not.Won't start now,no spark to number 1 plug.Why are points pitting up so much,and do you have any suggestions? My book does not show a resistor inline under dash,I was told ford had them on all vechicles up to 1948?
 
Problems with new points and condensers are very common now. The quality is just not there.

But take a close look at the distributor. Check for side play in the shaft and mechanical advance
mechanism. There must be very little movement, otherwise the points will not stay set. Also look for wear
on the cam. Points that are run out of adjustment will be very short lived due to arcing and overheating.

Also look at the vacuum advance mechanism (if equipped). Be sure it is not loose or moving the point
setting when vacuum is applied. If you can find a dwell meter, you can check the dwell running at different
RPM. It should hold steady at 28*. If it varies, there is a distributor problem.

As for the resistor, I doubt it has one being a 6 volt. But easy to tell, with the ignition on, points
closed, check the voltage on the battery side of the coil. If it is near battery voltage, there is no
resistor. If it is down around 4 volts or less, there is a resistor.

A 6 volt coil should have about 1.5 ohms resistance across the primary terminals, out of circuit.
 
To verify a match between the coil and primary ignition system, can you ACCURATELY check the primary ignition current draw, engine NOT running, points closed, ignition switch "on"?

Should be in the 3 to 4 Amp range. Less = weak spark, likely a primary resistor shat shouldn't be there with the coil you are using, more current = excessive coil heating and quick burning of points, needs a primary ignition resistor added.

Do the test quickly, and don't leave the ignition switch on for very long without the engine running, which overheats the points and coil!
 
If a car coil was put on the truck, it might be too low in resistance. A coil measuring 1.5 ohms would be too low in Ohms to use
with no resistor. 2.5 to 2.8 would be more normal. The 48 car does show a resistor in circuit. jim
 
I saw no mention of a new condenser? If it hasn't been changed, test it first. If it has, the new one could be bad. I have seen many more new ones bad out of the box that old ones that failed in service.

Checking the current draw as described by another poster is excellent advice also.

Maybe a little history info would help. Why were parts changed in the first place? Just a tuneup, coil failure or????
 
(quoted from post at 12:08:30 02/02/18) Morning, my 48 ford f1 226h positive ground is giving me electrical issues.2 sets of points,2 new oreillys 6v coils have been installed last 1000 miles.Truck has new wires,cap,rotor,plugs,newly rebuilt.Started to lose power under losd,missing,bucking,like out of gas,it's not.Won't start now,no spark to number 1 plug.Why are points pitting up so much,and do you have any suggestions? My book does not show a resistor inline under dash,I was told ford had them on all vechicles up to 1948?
Click to expand...
am looking at the original Ford Bonus Truck manual that came with my Dad's 1948 F-7 truck and it covers F-1, 2, 3, 4, 5, 6, 7, 8 trucks and has several wiring diagrams and description/trouble shooting instructions for the electrical/ignition systems for the various engines and nowhere is there an ignition resistor.
 
I understand it is a truck. I am trying to guess why it would burn points etc. The diagram attached does show a resistor in a CAR The armored cables shown in other diagrams could be resistance wires as well. Jim
<image src="http://forums.yesterdaystractors.com/photos/mvphoto10063.jpg"/>
 
I don't think there is such thing as good points anymore.

Not enough volume of sales to promote quality.

Might look on Ebay for NOS.

If this is not a show quality truck needing total originality, might look into a Pertronix electronic conversion. They are much more reliable. Only draw back, they are voltage and polarity sensitive. Have to be careful jump starting.
 
I have new condensor and coil ordered 6v,also regular tuneup.I found out my coil from oreillys was 6v but the description said external resistor needed,it did not say on coil,omly said 6v,so I ordered a new coil 6v with built in resistor and new co densor,arriving today,let you know,thanks
 
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