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Thursday 01/18/2018
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250 Amp Dual Battery Current Control System By Painless Performance

P/N 40102

250 Amp Dual Battery Current Control System


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American Made


Our 250 AMP dual battery controller includes a three position switch to control the second battery through the operation of the solenoid.

  1. Switch position one isolates the auxiliary battery.  No light.
  2. Position two connects the auxiliary battery while the ignition is on.  Green light.
  3. Position three connects the auxiliary battery at all times.  Red light.

Kit includes solenoid, toggle switch, pre-terminated wire/connectors, fuse holder, fuse and mounting hardware.  


Need battery cables?  Part #40100 is perfect for a front mount battery.  Part #40105 is perfect for a remote mount battery.

Have two auxiliary batteries?  Use the 40102 and an add on solenoid kit part #40112 to control them.

NOTE: For applications in which the system may be exposed to the elements, such as marine, use our weatherproof kit #40103.

 250 Amp Dual Battery Current Control System By Painless Performance



ECM Flash Program



This is a basic start and run tune that we only recommend for a near stock application. We will only change the following parameters: delete VATS/PASS-KEY security, cooling fan on/off temperatures, rear end gear ratio, tire size, speed limiter, rpm limiter, idle rpm, and we will adjust the check engine light parameters. If your setup requires any other parameters tuned you will need to locate a local tuner. All ECMs are left unlocked to allow easy access for your tuner.

Step 1: Purchase one of the qualifying part numbers. See below for that list.

Step 2: If your part number is highlighted RED proceed to step 3B. If your part number is highlighted BLACK, proceed to step 3A.

Step 3A: If you have arrived at this step, your harness does not come with an ECM and you must provide one to be flashed. Please reference the manual with your harness to confirm the ECM part number required.

Step 4A: Once you have received your harness, please cut the Barcode label from the box as shown in the picture below.

Step 5A: Package and mail your ECM along with the Barcode label, a copy of your purchase receipt, and your ECM form that you are about to complete. (The address will be provided after you complete the form). We will pay for return ground shipping*. If you request a faster service, you will need to provide a return label.

Step 3B: If you have arrived at this step, your purchase comes with an ECM. You must fill out our ECM form BEFORE your purchase will ship. Proceed to Step 6.

Step 6: Click the “Start Here” button below to fill out our ECM questionnaire.

Step 7: Once we have the ECM, we will use the data from the form to flash the ECM. Then, once it has been flashed we will package the ECM and ship it back to you. If we encounter a question, we will contact you. This process can take 1-3 days.

Step 8: Once you receive your ECM, it is ready to go.


*Note: Our free return shipping is ONLY good for the lower 48 states, via ground UPS. If you are outside of those states, you must provide a return shipping label with your order. If your purchase comes with an ECM, the shipping will be covered via the retailer you purchased from.



Click the Start Here button below to get your FREE ECM Flash!

Click Here To Start The ECM Reflash Process


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