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Howdy all. I have a 1950 Ford F1 that I have finally gotten to run. Well, after all my tinkering my battery was weak so I jumped the truck off. The truck will crank that way (twice) but after driving and letting run for 15-20 minutes it won't crank back. I took the battery in and voltage and cranking amps are on point. Put battery back on and starter turns strong but just won't fire back up.
Recently replaced condenser, points, coil, starter solenoid. Any ideas are greatly appreciated. When running it seems to run fine but I am not mechanically trained and could be over looking signs. Also my hearing is shot so if its a low or high pitched sound I'm out.
Thanks
1950 Ford F1 289 Flathead V8 6 Volt Positive Ground
Are your cables heavy enough for 6V? Are your grounds and connections clean and tight? Grounds: battery to block, block to firewall, body to frame, etc.
Most old truck that have been sitting have bad and/or dirty fuel. Pull the top off the carb and look inside. You will probably need to clean and flush the entire fuel system if you truck is like many of ours. Also I would charge or replace the battery. Some old coils need a full charge.
Sounds like it starts and runs when the engine is cold but not when warm? Lots of folks have had issues with brand new out of the box condensers. Sometimes they have an electrical leakage and look like a high resistance short across your points. You could try your old one to see if it makes a difference. Sounds like you got a strong crank so you're battery cables sound good but if you see any green corrosion around any of the battery or starter cable connections I would change them. You local NAPA jobber could build you a set. Ask them to use size 2/0 or "two ott" cable. I just changed a set of cables on my buddy's 50 F-3 with 6 volt ignition. He was so impressed with the improvement he changed battery cables on all his classic tractors too.
I had a similar problem and I fixed mine by checking and improving my grounds. I went from a head bolt to frame on both sides of the engine and the positive ground from battery and now it works well. Hopefully this helps.
On second thought, at one time I had a problem with starting and it turned out that the case ground between the started and the motor was gunked up. I took the starter off and cleaned all of the contact areas and then it started to work again. It might be that there is just dirt between your starter and the mount.
Most old truck that have been sitting have bad and/or dirty fuel. Pull the top off the carb and look inside. You will probably need to clean and flush the entire fuel system if you truck is like many of ours. .,...
Yep, the fuel line from the tank to the firewall is the low point of the system, and everything ends up down there. I cleaned and coated my tank, but was still having issues. After fighting clogged filters and carb problems constantly for months I pulled that line out and flushed it. Banged the line on the ground and more came out. After an hour of more and more coming out, I went to NAPA and bought new line. Never a problem since.
Thanks everyone. I will check the grounding on the starter and engine block this weekend - all other components (fuel pump, carb, coil, battery etc. are new). I just find it odd that with assistance from a newer truck jumping the battery that it will fire up and runs great. By itself - new battery - the starter turns over but it never fires off. Battery has been tested for voltage and cranking amps.
I went back and read your thread again and you mentioned that your truck starts with a jump start? I would really look at those battery and the starter cables. At 6 volts you need lots of current to spin the starter and thus the engine especially when cold. Any corrosion /resistance inside the cables and connectors adds to the voltage drop thus causing problems like this. I would start by really looking at those battery and starter cables! If they are standard 12 volt 4 gauge type or smaller they need to be changed to larger 1/0 or 2/0.
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