If you own an Allis Chalmers B tractor and want to upgrade its electrical system to a 12-volt configuration, you’re in the right place. In this guide, we will provide you with a comprehensive Allis Chalmers B 12-volt wiring diagram, along with step-by-step instructions to help you accomplish this task.
Why Upgrade to a 12-Volt System?
Before we dive into the wiring diagram, let’s first discuss why you might want to upgrade your Allis Chalmers B to a 12-volt system.
The original Allis Chalmers B tractor was designed with a 6-volt electrical system. While this system worked well at the time, it is now outdated, and many modern accessories and equipment require a 12-volt power supply. Upgrading to a 12-volt system will also improve the tractor’s starting ability, particularly in cold weather.
Another advantage of a 12-volt system is that it can handle more electrical load than a 6-volt system. This means you can add more accessories, such as lights or a radio, without overloading the system and causing damage or a fire.
Overall, upgrading to a 12-volt system will give you greater flexibility and reliability when using your Allis Chalmers B tractor.
Allis Chalmers B 12-Volt Wiring Diagram
Now let’s take a look at the wiring diagram you’ll need to follow to upgrade your Allis Chalmers B to a 12-volt system. This diagram assumes you are starting with a completely stock tractor with no modifications.
| Wire Color | Function | Original 6-Volt System | New 12-Volt System |
|---|---|---|---|
| Yellow | Starter Motor | 6-Volt Positive Ground | 12-Volt Positive Ground |
| Red | Main Power Feed to Fuse Box and Ignition Switch | 6-Volt Positive | 12-Volt Positive |
| Black | Ground | 6-Volt Positive Ground | 12-Volt Negative Ground |
| Green | Generator Field (F) | 6-Volt Positive Ground | 12-Volt Positive Ground |
| Green with Yellow Stripe | Generator Armature (A) | 6-Volt Positive Ground | 12-Volt Positive Ground |
| Brown | Distributor | 6-Volt Positive Ground | 12-Volt Positive Ground |
| Gray | Coil | 6-Volt Positive Ground | 12-Volt Positive Ground |
| Orange | Oil Gauge | 6-Volt Positive | 12-Volt Positive |
| White | Amperage Gauge | Not Used | 12-Volt Positive |
| Purple | Ignition Switch | 6-Volt Positive Ground | 12-Volt Positive |
Before you begin the wiring process, make sure to disconnect the battery and remove any electrical tape or wiring harnesses from the tractor.
Step 1: Connect the Batteries
Begin by connecting the two 6-volt batteries in series to create a 12-volt battery. Connect the positive terminal of the first battery to the negative terminal of the second battery. Then, connect the positive terminal of the second battery to the starter solenoid.
Step 2: Connect the Starter Motor
Connect the yellow wire from the wiring harness to the positive terminal of the starter solenoid. Then, connect the other end of the yellow wire to the starter motor.
Step 3: Connect the Main Power Feed
Connect the red wire from the wiring harness to the main power terminal on the starter solenoid. Then, connect the other end of the red wire to the fuse box and ignition switch.
Step 4: Connect the Ground
Attach a black ground wire from the battery to the tractor’s frame. Then, connect the other end of the black wire to the engine block.
Step 5: Connect the Generator
Connect the green wire from the wiring harness to the F terminal on the generator. Then, connect the green with yellow stripe wire to the A terminal on the generator.
Step 6: Connect the Distributor and Coil
Attach a brown wire from the distributor to the negative terminal of the coil. Then, connect a gray wire from the positive terminal of the coil to the ignition switch. Finally, connect a purple wire from the ignition switch to the positive terminal on the starter solenoid.
Step 7: Connect the Gauges
Connect an orange wire from the oil gauge to the ignition switch. Then, connect a white wire from the amperage gauge to the main power feed on the starter solenoid.
Once all the wiring is completed, reconnect the battery and test the electrical system to ensure everything is functioning properly.
FAQ
What type of wire should I use for the 12-volt upgrade?
It is recommended to use high-quality, automotive-grade wire for the 12-volt upgrade. This will ensure a reliable and safe electrical system.
Do I need to upgrade the alternator?
If you are only using the tractor for light-duty tasks, such as mowing or hauling small loads, the original generator should provide enough power. However, if you plan to use the tractor for heavy-duty tasks, such as plowing or tilling, you may want to upgrade to a higher-output alternator.
Can I still use all the original accessories with the 12-volt upgrade?
Most of the original accessories, such as lights and gauges, can still be used with the 12-volt upgrade. However, some accessories may need to be modified or replaced with 12-volt compatible versions.
Is it difficult to upgrade to a 12-volt system?
While upgrading to a 12-volt system does require some knowledge of electrical systems, it is a relatively simple process that can be completed with basic tools and a little bit of patience.
Will the 12-volt upgrade void my tractor’s warranty?
Since most Allis Chalmers B tractors are well out of warranty, upgrading to a 12-volt system will not void any warranties. However, if your tractor is still under warranty, you may want to consult with the manufacturer before making any modifications.
Do I need to adjust the timing after upgrading to a 12-volt system?
Generally, you will not need to adjust the timing after upgrading to a 12-volt system. However, if you experience any issues with the timing or ignition, it is best to consult a professional mechanic for assistance.
Conclusion
Upgrading your Allis Chalmers B tractor to a 12-volt system will give you greater flexibility and reliability when using modern accessories and equipment. By following the wiring diagram and step-by-step instructions provided in this guide, you can easily upgrade your tractor’s electrical system and enjoy all the benefits of a 12-volt power supply.
