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What should my AMP GAUGE read when my 1956 CUB is running

B

BOB2014

Member
when my 1956 CUB is running my amp gauge reads around 15 to 20 AMPS someone rewired it. It has a key start and a switch to turn the AMP gauge on and off?? what should it read or what makes it read so high???? Bob
 
That's fine if your battery is half flat or has something wrong with it. If the battery is good and charged it should read about 10 when started and then settle back to an amp or two within a minute of running.

If it is continuing to charge like that I would replace the battery with a known charged one that is good and see what happens. If it still does it I would be digging into the charging system. It will fry a good battery in short order if you run it for a length of time while overcharging BTDT.
 
A lot of guys used to ground the field terminal.
That makes them charge full force all the time.
That worked Ok on ones that were only ran short periods,
but it will boil a battery dry if ran that way too long.
I would check the wiring out to see what they did.
 
Does your cub by chance have an alternator and you have to use the switch not only to turn the amp gauge off, but also to get the engine to stop? Very few cub generators will put out 15 to 20 amps, most of them are only capable of 11 amps.
 
I'm not very good at this what is the best way to start checking the system what should I replace or check first and how ...need all the help I can get
 
no it has a generator, if I turn the amp gauge off it still runs I only ran it for about 15 minutes and everything seems fine but it worries me with that reading??
 
how is the best way to start I'm not very good at this anything simple to check and find out what is wrong
 
Thats the problem someone rewired it. Get the original wiring drawing then check the Delco # on the gen and then get the correct regulator for that gen and rewire correct and you will be ok.
 
i think id order a new harness and wire it back like ih wanted it to be, i ran my "49 cub all day yesterday mowing and after the first minute the amp gauge barly moved, unless i turned the switch , i read it only should show something like .3 amps when running with a fully charged battery , also check your battery to make sure it doesnt have a internal short or dead cell
 
You shouldn't go replacing things until you know what you have to start with. The fact that you are "green" at this and don't know what you're looking at makes that difficult.

Someone posted a link to John T's troubleshooting guide. That's about as simple as it gets. It explains the charging system and gives you simple tests to perform.

But, you've got to get it wired correctly before the tests mean anything.

The best thing to do is remove the hood and gas tank to expose all the wiring first.
 
If it reads 15 to 20 all the time and even after long hours of use especially with lights off I fear it may overcharge the battery. Theres a chance the VR (if it has one??) may be bad,,,,,,,,,,or someone permanently dead grounded the Gennys FLD terminal cuz Billy Bob and Bubba told them it made her charge real good,,,,,,,,,,,or if it has the LHDB light switch charge control (uses cutout relay) the wire up from the gennys FLD post is somehow always grounded.....or the battery is bad like a shorted cell etc

With a good battery Id expect a high charge rate for a time (if it uses a VR) but then it would back off to 1 to 5 amps depending on RPM and lights etc. If it has the LHDB and cutout relay Id leave it on high charge maybe 30 to 60 mins (20+ amps)then put her on low charge (maybe 1 to less then 10 amps subject to RPM and battery)

Jim was kind enough below to post my Troubleshooting Procedure

John T
 
looks like they did ground the field terminal if I disconnect that wire is that all that is necessary??
 
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