Generator cut-out

chrisabes

chrisabes

Member
Over the past few months, we have had instances where the generator cut-out has failed, once it did not open on engine shut down and the second time it failed to close with the generator operating.
This has got to get me thinking, what would I do if I did not have a spare cut-out on a long trip? My "bush mechanic" logic tells me to remove the faulty cut-out, start the engine , then attach a jump wire from the generator terminal to the cut-out lead. Before stopping the engine, disconnect the jump lead the switch off the engine.
My understanding is that the cut out serves one purpose, and that is to prevent battery voltage getting to the generator but allowing generator charge to get to the battery. It is purely a switch and does not regulate the charge?
Am I correct ??
 
Yes your correct and use an adequate sized wire as a jumper. Also remember a generator can fry itself when it's isolated from the load. That's why I run diode cutouts nothing to stick or hang up
 
Are you using a reproduction or original ?
The originals are pretty bullet-proof and the repo's have been problematic.
The cover can be removed on the originals and cleaned/ adjusted.
I like using an original along with one of Tom W's EVRs.
 
The diode cutout is simply a one way valve for electricity. As the current flows through it the voltage drops about .7 volts and the diode heats up. For this reason the diode needs to have a good amp rating and a good heat sink. A&L makes a quality diode cutout, and I'm not sure who all sells their product, or one of similar quality.
 
On my 29 tudor my "cutout" is my right hand on the master switch mounted near the starter! Actually I am running an alternator, but I like the peace of mind of knowing that no current is flowing anywhere when I am away from my tudor. :D
 
When shutting down, check for an ammeter discharge, indicating the cut out might be STUCK. Try "tapping" on it & re-check the ammeter reading. This is not an uncommon happening. "Sometimes", re-starting & shutting off will open it.
I had one BEAUTIFUL cut out, with a riveted-on cover, it would stick often. When I remove the cover, part of the innards were BENT & it had only a tiny amount of air gap! I straightened it & it worked perfect! Looked as though the assembler dropped it, just before the cover went on???
Bill W.
 
Last edited:
Indiana A. Lover said:
Mitch Can you post more on Diode cut out? I am not up on these. But am interested. Thanks Don
Click to expand...

Don
You can buy just a diode and convert an old style cut out or purchase a semi conductor cutout assy.. Check brattons or snyders web site....
I use the diode style with Tom's EVR his units can be wired for either way.. I'm for having no moving parts or contacts to fail
 
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