730 Diesel Elec Start-12 volt wiring

fordpowr

New User
Good morning,

I recently acquired a 1959 730 Diesel (24v elec start). Based on what I have found, only 24v is hooked up currently. The lights are disconnected at the lights themselves. I am trying to figure out how to get 12v from one of the batteries to the switch (since I assume 12v comes back off the switch to the lights/dash indicator, etc.). I have several manuals, but this connection is not clear to me. Thanks in advance.
 
. Half of the lights/gauges are positive to chassis and are supplied by one 12V battery . The other half of the lights and gauges are negative to chassis and are supplied from the 2nd 12V battery.
 
(quoted from post at 08:41:03 10/20/19) Good morning,

I recently acquired a 1959 730 Diesel (24v elec start). Based on what I have found, only 24v is hooked up currently. The lights are disconnected at the lights themselves. I am trying to figure out how to get 12v from one of the batteries to the switch (since I assume 12v comes back off the switch to the lights/dash indicator, etc.). I have several manuals, but this connection is not clear to me. Thanks in advance.

The "A" terminal on the light switch is fed (-) 12 Volts and the "B" terminal on the light switch is fed (+) 12 volts.

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(quoted from post at 07:32:24 10/20/19) . Half of the lights/gauges are positive to chassis and are supplied by one 12V battery . The other half of the lights and gauges are negative to chassis and are supplied from the 2nd 12V battery.

Thank you. I assume that the bulk of these connections are made in the battery box. The fender lights and rear light have spade connectors on the end of their wires that are more than long enough to reach the battery box. I have the manuals but the 12v side is not called out well.
 
(quoted from post at 09:53:46 10/20/19)
(quoted from post at 07:32:24 10/20/19) . Half of the lights/gauges are positive to chassis and are supplied by one 12V battery . The other half of the lights and gauges are negative to chassis and are supplied from the 2nd 12V battery.

Thank you. I assume that the bulk of these connections are made in the battery box. The fender lights and rear light have spade connectors on the end of their wires that are more than long enough to reach the battery box. I have the manuals but the 12v side is not called out well.

"I assume that the bulk of these connections are made in the battery box."

That would be an INCORRECT assumption.
 

Do you have the real John Deere electrical manual ?
Is the wiring harness intact or has some amateur been hacking it up and left you a mess to repair ?
 
There's a ground wire that hooks to the frame from the terminal of the second 6v battery to the third battery. The lights quit working on my 1960 730 Diesel electric start one time. There was an old two cylinder guru here at the time who told me about that ground. He said even a piece of fence wire will do it,but I used a coated wire of course. With that ground hooked up,the lights should work as wired from the solenoid.
 
Thank you all. I suspect that the harness has been modified over the years. I ll send pics of what I am looking at along with the wiring diagram I have from my Deere book.
 
Where that cable connects the positive and negative from one battery to the other,touch that blue wire that's connected to the inside of the battery box,to one of those posts. That's supposed to be grounded right there between those two batteries. If you touch that to a post and everything else is right with your wiring,you should have 12v to the lights.
 
Thank you. I will give that a try. I am still having trouble figuring out where the sets of spade terminals coming from each fender and from the rear light plug into. This tractor has the fender with dual headlamps. There are two wires running down each fender well support that are probably 6 feet long and they have male spade ends on each wire. They are wired into the headlamps. The rear lamp has wires coming off of it through the seat support and into the battery box with this same spade connectors seen in the photo. It seems that I?m missing something to get all of these connected. I will add that neither the dash light nor the generator light function either. Thanks.
 
The 2 wires running in the fender mount are 1 wire for each headlamp. The ground side is through the chassis. I've re-wired lights like that by providing actual wires to a solid place on the chassis since rust, corrosion and dirt fouled the chassis ground path.
 
Where do you live? Maybe there is someone close by who can help you in person. Wiring is hard to explain in words here even with having John Deere manuals to follow.
 
Bob.

Did this schematic come from the tractor manual? It looks the same as the schematic on page 80-5-20 of Electrical Systems Service Manual SM-2029 but has the Figure 41A description below it here. SM-2029 schematic does not identify it as Figure 41A.
 
Thanks all. I m in North Texas. A gentleman from the local club I am a member of is going to come out and work on it with me.
 
(quoted from post at 07:54:29 10/22/19) Thanks all. I m in North Texas. A gentleman from the local club I am a member of is going to come out and work on it with me.

What part of N Texas? We might be neighbors. I live in Coyote Flats which is 30 miles south of Ft Worth.
 
(quoted from post at 05:53:41 10/22/19)
(quoted from post at 07:54:29 10/22/19) Thanks all. I m in North Texas. A gentleman from the local club I am a member of is going to come out and work on it with me.

What part of N Texas? We might be neighbors. I live in Coyote Flats which is 30 miles south of Ft Worth.



Rockwall. Not too far away given how big TX is.
 

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