'48 Cub rear light problem

Thu Sep 19, 2013 10:00 am

Hi all. I've been working on my '48 Cub to update the wiring. I have the 6-volt cub with Magneto. I purchased a new wiring harness for it from Brillman. I also installed a new 4 position Cutout light switch, a new starter lever switch, new Magneto J4 coil cover, new 6-volt cutout, new spark plug wires, and a new 6-volt rear combo light assembly. I have everything wired up and the headlights are working but the rear light is not.

I wired the system as follows:
headlamps to the 4 position light switch (position #3)
taillamp to the light switch (position #2)
ammeter "-" terminal to light switch (position #1-fuse connector)
ammeter "-" terminal to relay (cutout) "Bat" connector
ammeter "+" terminal to starter
generator "F" to light switch
generator "A" to relay (cutout) "Gen"
ignition switch to magneto

I've attached photos too. There are two other wires that came in the Brillman wiring harness kit that I did not use. They are:
Light switch to ignition system (with battery ignition only)
Coil + to distributor (battery ignition only)
These were a little confusing to me, but I assumed that if I had a Magneto (even thought the tractor has a battery and it won't start if the battery is drained) then I did not use these wires. Is that correct?

Any ideas of why the brand new rear light with brand new wiring would not be working? Thanks for your help!
You do not have the required permissions to view the files attached to this post.

Re: '48 Cub rear light problem

Thu Sep 19, 2013 10:05 am

did you test the rear light to make sure it works, just a couple of jumper wires from the battery to the light, test for power at the light? have a good ground?,
good luck Tim

Re: '48 Cub rear light problem

Thu Sep 19, 2013 10:52 am

Well duh! I should have thought of that. But you'd think a brand new light would work. I disconnected one of the front lights that I know is working and connected the new tail light to it. Nothing. There is only one wire on the tail light so I ran a jumper from it to the battery. Nothing. I'll send it back and try to find another light. Thanks.

Re: '48 Cub rear light problem

Thu Sep 19, 2013 11:22 am

Before you go to the trouble of sending it back, did you check the bulb to see if the filament is broken?

Re: '48 Cub rear light problem

Thu Sep 19, 2013 11:30 am

Yes the filament looks fine. Neither the white or red lamp are coming on.

Re: '48 Cub rear light problem

Thu Sep 19, 2013 1:16 pm

Check your voltage at the wire connection on the outside of the light reading between the and ground on the battery. If you have it there, then check to ground at the light mount. My guess is no ground. You can also check for continuity between the lamp socket and ground. I suspect a bad ground...

Re: '48 Cub rear light problem

Thu Sep 19, 2013 1:24 pm

Boy do I feel stupid. Before mounting the new light I wanted to test it out and make sure it worked and that the new wiring worked. Never occurred to me to ground the light. Just standing there with it in my hands, and scratching my head. :) Problem solved. I've got a lot to learn about this tractor, but I won't make that mistake again. Thanks all for your help!

Re: '48 Cub rear light problem

Thu Sep 19, 2013 4:09 pm

Thanks for admitting that mistake, it's one many of us have done. And not to laugh at you, but with you, I have to admit that I got a good chuckle at your predicament. I needed that release just getting home from work. Thanks again for a humorous post, good luck with the Cub!

Re: '48 Cub rear light problem

Thu Sep 19, 2013 8:34 pm

I have fought lights on my cubs until I just gave up and said,--dont need them anyway!lol!!---not worth the hassle of getting/keeping them working! thanks; sonny

Re: '48 Cub rear light problem

Thu Sep 19, 2013 8:43 pm

Front and rear lights are working now. Enjoying getting everything to work correctly. :)

Re: '48 Cub rear light problem

Thu Sep 19, 2013 8:55 pm

SONNY wrote:I have fought lights on my cubs until I just gave up and said,--dont need them anyway!lol!!---not worth the hassle of getting/keeping them working!
Same here. Don't use the tractors at night. Dismounted the lights, cut off the wires, placed the lights on the bench.

Re: '48 Cub rear light problem

Thu Sep 19, 2013 9:16 pm

We've all been there...glad you got it working :)

Re: '48 Cub rear light problem

Fri Sep 20, 2013 6:02 am

Where did you get those wires????...nice...

Re: '48 Cub rear light problem

Fri Sep 20, 2013 8:51 am

From Brillman.com. The wiring harness and the spark plug wire set all have an original look to them.
http://brillman.com/store/b3024-001-far ... -wire.html

Re: '48 Cub rear light problem

Fri Sep 20, 2013 9:31 am

Thanks.... :D