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post #1 of 2 Old 04-29-2019, 04:16 PM Thread Starter
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Ford LGT17H cutting out

I have an 83-84 vintage Ford LGT17H garden tractor which is cutting out, as if the electrical system is shorting out. Starts fine and runs, but ever so often engine dies. Only way to keep engine running is to depress the brake/clutch or repeatebly keep stepping down the brake pedal rapidly. After pumping the brake pedal several times the engine stays running. Maint. manual indicates several safety switches, but no diagram as to location. Only obvious electrical device near the brake pedal is the brake light activator switch. A replacement part for that switch has yet to be found.
Any ideas as to possible cause or anyone encountered the same issue and resolved.
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post #2 of 2 Old 05-04-2019, 09:20 AM
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Re: Ford LGT17H cutting out

If the brake also operates the drive clutch, thus unloading the engine from moving things, you may just be taking away enough load to allow the engine to keep going.
I'd check fuel supply, as that is a common problem. Depending on engine, fuel supply layout, etc, you could be having 'vapor lock'. Does this happen more on hot days?
Another possibility, less likely, would be the magneto or ignition system if you have a powered coil & distributor. I don't know the Ford models at all, nor engine installed.
Some who have fuel supply problems, pump, filter, plugged tank outlet, etc, find that applying some choke may get the engine to run better for a while. The choke may apply more vaccum and allow fuel to be pulled from lower levels in the float bowl.
If you try adding choke, and it helps, look for a fuel problem.
Most magneto failures will either be dead as a doornail all the time, or work intermittently with variation brought about by temperature changes. Check that your 'kill' wire is not bare or chafed, and that it is secure to the ignition switch. If you have a magneto be careful to keep 12v away from the kill wire or you will kill the magneto.
tom

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