I have a 68 3020 diesel with 24volt system. The light switch appears to have been straight wired to a battery. When I run lights, it seems to pull batteries down. Can anyone provide a diagram that shows where the ground should connected and where the lights should be powered if wired straight to one of the two batteries?
- Thread starter twalker10
- Start date
The center point of the two 12 Volt batteries connected in series is supposed to be connected to the chassis.
That gives you a source of 12 Volts (+) at the post on the starter "belly" facing the engine block, and 12 Volts(-) at the top terminal on the starter solenoid. (This is with respect to the chassis "ground".)
They used a 2 circuit light switch, the voltage from those points at the starter was brought up to the light switch though several connectors and breakers.
Roughly half of the lights are fed from the (+) half of the switch and the other half from the (-) side of the switch, evening the load on the two batteries.
If things have been changed around (all the lights fed by one battery, for example) it doesn't work out very well.
Check it out and post back with any questions. Probably will get the most help if you post at the DEERE-specific Board lower down on the page.
That gives you a source of 12 Volts (+) at the post on the starter "belly" facing the engine block, and 12 Volts(-) at the top terminal on the starter solenoid. (This is with respect to the chassis "ground".)
They used a 2 circuit light switch, the voltage from those points at the starter was brought up to the light switch though several connectors and breakers.
Roughly half of the lights are fed from the (+) half of the switch and the other half from the (-) side of the switch, evening the load on the two batteries.
If things have been changed around (all the lights fed by one battery, for example) it doesn't work out very well.
Check it out and post back with any questions. Probably will get the most help if you post at the DEERE-specific Board lower down on the page.
buickanddeere
Well-known Member
. As previously stated, all lighting and electrical loads have to be wired to equally load each battery equally.
I maybe a purist in restorations but......... a 12V conversion maybe of consideration. There are some high output 12V starters that will crank the engine even faster than the factory 24V system.
The old wiring harness is getting tired and has been tinkered with . This shop builds quality wiring harnesses at reasonable rates . Also equipped with circuit breakers which are sorely missing on the original wiring.
http://www.wiringharnesses.com
I maybe a purist in restorations but......... a 12V conversion maybe of consideration. There are some high output 12V starters that will crank the engine even faster than the factory 24V system.
The old wiring harness is getting tired and has been tinkered with . This shop builds quality wiring harnesses at reasonable rates . Also equipped with circuit breakers which are sorely missing on the original wiring.
http://www.wiringharnesses.com
jim buford
Member
Electrical is not my strong suit by any means. Correct me but I was of the opinion the two 12 volt batteries were connected in parallel to double the amperage but keep the volts at 12. Please clear this up for me. Thanks
Jim.ME
Well-known Member
- Location
- central ME
Yes, two 12 volt batteries in parallel is still 12 volts, with more capacity. Two 12 volt batteries hooked up in series are used to make 24 volts.
Thanks for all of the feedback. It appears I have two options. One is to install a new wiring harness on the 24v system to be sure lights are pulling equal loads from the batteries. The second is to convert to 12v. For those who convert to 12v, do you just use one battery or do you reconnect the two batteries in parallel?
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
Two 12 volt batteries will give more cranking capacity especially needed in colder climates. JD changed to two 12 volt batteries instead of two 6 volt batteries on their 55 series rowcrop tractors for better cranking power
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
Sorry I left out 12 volt batteries attached in "parallel"
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