You just bought a new set of batteries, or you are moving them for a repair. Now you are staring at a pile of cables and wondering which one goes where. A wrong connection can fry your controller, melt a cable or leave you with a cart that will not move.
At Pit Stop Batteries, we wire carts every week. The good news is that the idea is simple once you see it. This guide shows the layout for 36V and 48V carts with text diagrams you can follow.
The Basic Rule: Wire in Series
Golf cart batteries are wired in series. That means the positive post of one battery connects to the negative post of the next. Each battery adds its voltage to the total, like links in a chain.
The chain starts at one open negative post and ends at one open positive post. Those two open posts connect to the cart: the main negative cable and the main positive cable.
Your total voltage depends on how many batteries you use and their size:
| Cart voltage | Battery type | Number of batteries |
| 36V | 6V | 6 |
| 36V | 12V | 3 |
| 48V | 6V | 8 |
| 48V | 8V | 6 |
| 48V | 12V | 4 |
Need help with the math? Our guide on how many batteries a golf cart needs explains it in more detail.
Before You Touch Anything
Safety comes first. These batteries hold a lot of power, and a dropped wrench across two posts can cause a big spark.
- Turn the key off and set the cart to tow or maintenance mode.
- Wear safety glasses and gloves, and take off rings and watches.
- Take a photo of the current wiring before you remove any cable.
- Disconnect the main negative cable first. Reconnect it last.
- Use insulated tools when you can.
- Work in open air, since charging batteries can release hydrogen gas.
36V Wiring Diagram With Six 6V Batteries
This is the most common 36V setup. Here is the layout, numbered by battery. Think of each line as a short cable.
CART (-) main cable
|
[B1 -] 6V [+ B1] —- [B2 -] 6V [+ B2] —- [B3 -] 6V [+ B3]
|
[B6 +] 6V [- B6] —- [B5 +] 6V [- B5] —- [B4 +] 6V [- B4]
|
CART (+) main cable
In plain words:
- The main negative cable goes to the negative post of battery 1.
- A jumper runs from the positive of battery 1 to the negative of battery 2.
- Keep going: positive of 2 to negative of 3, and so on.
- The last battery in the chain has an open positive post. The main positive cable goes there.
The exact order of batteries inside the tray depends on your cart’s make, so follow your photo. What matters is that the chain stays unbroken and in series.
48V Wiring Diagram With Six 8V Batteries
This setup works the same way, just with higher-voltage batteries. It is common on newer carts.
CART (-) -> [B1] -> [B2] -> [B3] -> [B4] -> [B5] -> [B6] -> CART (+)
each link: positive of one battery to negative of the next
Six 8V batteries give you 48V. The steps are the same as the 36V layout, only the batteries are bigger and there are fewer of them than with 6V units.
48V Wiring With Eight 6V or Four 12V Batteries
- Eight 6V batteries: Same chain idea, just longer. Positive to negative, one after another, until all eight are linked.
- Four 12V batteries: Much shorter chain. Positive of 1 to negative of 2, positive of 2 to negative of 3, positive of 3 to negative of 4.
If you are thinking about changing your cart’s voltage, read our post on upgrading a 36V golf cart to 48V. It takes more than new batteries, since the controller, motor and charger must match.
How to Check Your Wiring Before You Drive
After everything is connected, use your multimeter before you turn the key.
- Set the meter to DC volts.
- Place the probes on the main positive and main negative cable ends.
- The reading should match your cart’s voltage, or a bit above it with a full charge. A 36V pack should read about 38V and a 48V pack about 51V.
- If the number is far lower, a jumper is loose or a battery is wired backward.
Our guide on testing golf cart batteries with a multimeter and hydrometer shows what each reading means.
Common Wiring Mistakes
- Connecting positive to positive. This is parallel wiring, not series. It gives you low voltage and can damage parts.
- Reversing the main cables. This can burn the controller.
- Loose connections. A loose post causes heat, voltage drops and melted terminals.
- Mixing old and new batteries. Weak batteries pull the pack down. See can you mix old and new golf cart batteries for why this fails.
- Rusty hardware. Use stainless steel nuts and anti-lock washers so connections stay tight and clean.
- Skipping terminal protection. Corrosion builds fast in Florida. Read about terminal corrosion causes and prevention and keep the posts coated.
Tighten each connection to the manufacturer’s torque spec. Overtightening can crack a post, and loose posts cause heat.
DIY or Professional Installation?
Wiring is easy to learn but easy to get wrong, and a mistake can cost far more than the labor. If you are unsure, weigh the risks in our guide on professional installation vs DIY. You can also see examples of clean finished jobs in our gallery.
Frequently Asked Questions
Do I wire golf cart batteries in series or parallel?
In series. Parallel wiring is not used in standard golf cart packs.
Which cable do I disconnect first?
The main negative cable. Reconnect it last.
Can I wire 6V batteries for a 48V cart?
Yes, you need eight 6V batteries. Make sure your charger and controller support 48V.
Does the battery order in the tray matter?
The chain order matters, not the physical spot. Follow the photo you took before removal.
Need Help With Your Wiring?
If your cart will not start after a battery swap, or you want a clean installation done right, our team is ready to help. Learn more about our golf cart battery installation service or contact us today.