For 300 and 400 amp controllers.  This option upgrades the SW180 200 amp solenoid to 36v now and 48 volt operation later for any SR300 or SR400 combo controller/solenoid selection above.

Note the 400 solenoid listed with the SR500 and 600 is already 36/48 volt compatible;

Refresh the page to see current stock status

The Controller combos including the big 400 amp solenoids like the MZJ400A  require two 3/8ths cable connections. Stock cable connections are 5/16ths.

Add 2 big 3/8ths copper cable connection lugs here

Series controllers


350 amp peak amp flow

All SR units are 36-48v operational without a program change.

Copper 3/8ths cable lugs

Please read >  In checkout click 'more' to show all selected options to the seller. 

Fan kit is included with all 500 and 600 amp controllers

It is an addon option for all 300 and 400 amp controls

36/48v solenoid upgrade

All SR controls receive free programming before they ship. 

Choose throttle type & reverse speed/power % for your model

from the drop down menus in the add to cart button

Selecting Ezgo adds the solenoid bracket needed for TXT installation

Note that 100% reverse is usually selected for off road use only

SR controller and SW202 reversing contactor 

Ezgo TXT install shown

For 300 and 400 amp controllers. Add on the Fan kit for longer peak output.

High output creates heat. Reducing controller temperature extends the peak output time avoiding thermal cutback when you need power most.

Alltrax SR Fan Kit

Above link is an add-on for controller purchase.

Use link below for separate resistor & diode purchase

Refresh the page to see current stock status

BIG 3/8ths cable lugs

 2 Year



Refresh the page to see current stock status

Alltrax speed controllers are made with the DIY person in mind.

Some crimp on connectors may need to be changed for installation.

Most people with some mechanical ability can do this.

This is a level 2 upgrade

See the install rating system here

Higher peak and sustained outputs.  Reverse polarity protection. Optional solenoid control & safety lock while charging. Optional fan standard on 600 amp units.

A big selection of throttle inputs in the drop down menu fits all series carts.

Easy usb cable programming means you can enjoy fully adjustable throttle & torque curves and  set motor rpm limit,  reverse speed limit, acceleration time, and more.

  Add the complete cable set get a free in dash meter with key switch plate or trim piece

Refresh the page to see current stock status

Select voltage / terminal size

How to Order

1. Use the drop down menus to select the options you want.

2. Selections package options from controller alone to complete systems.

     Discounts escalate as needed options like F&R and cables are added on

3. Select the throttle type by identifying the make and year of your cart

4. 50% reduced reverse speed is default. Easily changed with laptop (or PC) and usb printer cable

5. If adding cables to your order select the proper battery configuration like 6/6v or 6/8v etc.

When selections are complete - click add to cart and proceed to the secure checkout

6. In check out click 'see more' if all options selected are not shown 

                                Note - Ezgo TXT solenoid bracket included

For help with selection or install email

 Exgo TXT owners pay more elsewhere. Get a FREE solenoid bracket 

FREE  resistor and diode with every series controller combo.

​That's a $30 value !

Select voltage / value
SR48600/400 Options
Select throttle info below
Battery info needed
48v Club Car cable info only

36/48v solenoid option

​for 300 and 400 amp combos

Note all Alltrax SR controls are compatible with the speed shift on the fly

For more info on FN speed switch click on Alltrax FN Products  

Discounts on combo kits

​Save Money

All series speed controller & solenoid combos include a free resistor, and diode.

Select ​Ezgo ITS programming and receive a FREE solenoid bracket

MZJ400A ​solenoid requires 3/8ths cable connections.

Our cable set include big cable ends where needed. 

All others find the big cable ends on the solenoid page in the main menu

Run your 36v series cart on 48 volts for more Speed

48 volts produces more torque, more speed, more efficiently than 36 volts

Cable sets offered above are complete 2g welding lead with copper lugs

sealed with adhesive lined heat shrink for water and acid resistance.

Free battery meter with any controller and cable set order

Fan Kit

SR48600 with fan kit  & 400 super solenoid

optional 400 solenoid mounting bracket for Ezgo  

570 peak amps for the biggest aftermarket motors

570 peak amp output

Inquire for pricing and availability 

 #5  SR48600  the Biggest 

Maximum output for all aftermarket motors 

​680 amp peak output

Controller   +    Solenoid   +   Cables  +  HD switch  or  SW202 contactor

Refresh the page to see current stock status

Make a selection in all 3 drop down menus

before clicking add to cart.

 Alltrax SR controls are compatible with the speed shift on the fly

Alltrax FN Products  

 Add an extra  36 or 48v resistor to your controller package purchase below.

Allows 36v operation now and 48v operation later by swapping resistors.

SR48500/400 Options
Select throttle info below
Battery info needed
48v Club Car cable info only
SR400/200 Options
Select throttle info below
Battery info needed
48v Club Car cable info only
SR48300 Options
Choose a throttle program
battery type

Tech notes:

All of the motor current flows through the F&R  switch in SERIES carts.

For the best results upgrade the Forward & Reverse switch and the cable set

in the series carts when upgrading the speed control.

See our Reversing contactor kitsfor the BEST in HD shifting and convenience.

We sell a complete line of Admiral motors to meet your  needs. 
Healthy batteries are mandatory !

Install cable upgrades for the best results.

Bigger cables provide less resistance & deliver more amperage.

More amperage = more torque.  Happy Carting!

Item #4 SR48500 controller  

Our most popular kit for on and off road use

The Huntin' Buggie pkg SR48500 + 400 HD Solenoid

Package deal discounts in the drop down menu
The Alltrax SR48500 control runs on 36 or 48 volts 

The 570 amp peak is higher than any competitor in it's class

400 amp solenoid required. See option #2
A great combination for modified golf carts with big tires and rear seats. 
Suitable for off road hunting buggies and aftermarket motors. 
Use were bigger tires, added seating, or hills increase the torque demand 

Item #2    400 controller with HD 200 solenoid option
 All around Campground & Neighborhood speed controller
460 peak amp output, 36 or 48 volt operation, choose a 200 amp heavy duty solenoid with a free resistor, & diode. 200 amp HD solenoid is available in 36, 48, or 36/48 volts.

Good for moderately bigger tires & rear seats on moderate terrain.

(For really BIG tires, steep terrain, heavier loads,  see SR48500 below)
Resistor and Diode, and safety main Fuse are included with controller/solenoid combo.
460 peak & more sustained amperage output than the competition or previous models

More amperage = more torque for bigger tires and hills. All controllers are pre-programmed. User programming is optional - the software is FREE. The new Alltrax Toolkit software is

the most user friendly program ever offered to the DIYer. Email if you have questions selecting the correct controller or throttle for your cart. Current price is our lowest price. Free solenoid bracket for TXT. Free resistor and diode on solenoid combos. You won't get more for less - anywhere on the net. See the drop down menu for the BEST pricing.

        Select cart & voltage before adding controller to the shopping cart.  

     Alltrax SR  Controller packages
        300-600 amp speed controllers or all make Series carts.

The SR controls are the newest generation. They have reverse polarity protection on both input and output sides, 
So the controller is protected from any mishap or install error. Other features are new like built in cooling fan and automatic throttle signal calibration.  Increased peak and sustained outputs make the 500 equal to the old 600 controls.... Free program options allow the user to build their own throttle and torque curves with a simple USB printer cable and free software at
Built in cooling fan extends peak performance by reducing heat. Fan included on all 500 and 600 amp units. Simple add-on for 300 and 400 units.

Each controller carries a full 2 year replacement warranty.

See 10 reasons why the new Alltrax controllers are the best ever!

<click "about Alltrax controllers" here >

Item #1     Alltrax new SR48300    For all years Ezgo / CC/ Yamaha/ others

300a Alltrax SR48300 control & SW180 200 amp solenoid discount for both
Better than stock replacement controller and solenoid package

350 peak amp output & higher sustained output compared to any competitor
Durable Alltrax 300 amp 
controllers are a smart replacement choice.
Free program software from Alltrax. Simple usb connection for programming
Allows for custom throttle curves, acceleration rate selection, & more.

All controllers come preprogrammed. User programming is optional.

Simply select your cart from the drop down menu when ordering.

All Controller & solenoid combos include a free resistor and diode 

Speed controllers and solenoids must be matched correctly

Most stock solenoids are 50-70 amps. This is ok for a 300 amp control.

400 amp control requires a 200 amp solenoid.

500 amp control requires a 400 solenoid

The  Speed Control regulates the amperage flow 

from the battery pack to the motor.

The Solenoid is the on/off switch between speed controller

and the battery pack. (amperage supply)

Bigger tires, more passengers, soft footing and hills

​all require  increased amperage flow.

A special note about SERIES golf cart performance below

Voltage = speed. Amperage = power. A common complaint we hear is the cart is too slow. Increasing the battery voltage from 36 to 48 volts

is a sure fire way to increase power and speed.

​And more voltage requires less amperage which reduces component heat.

Series Controller



golf ​​​​​​​Carts Unlimited

Click image below for shift on the fly option information

Refresh the page to see current stock status

Series SR48400

460 amp controller

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Golf Cart Accessories