Tesla Roadster

Battery in trunk conversion kit

The secondary 12 Volt battery, which provides power to Vehicle Management VMS, Horn, Headlights, Audio, Door Locks, etc. is located in a fairly inaccessible place – the passenger wheel well.

It requires replacement every two years, usually alerting owners with the “SWP Aux Battery Error”. Our 12 Volt battery relocation kit makes future battery replacements, a quick 3 minute DIY process.

Kit & Install

$924

Turn off the APS through the diagnostic menu. To get at the old battery, remove the front passenger wheel and fender skirt.

Disconnect both positive and negative wires and cut off both terminal legs. Both will be crimped onto the battery extension cable later.

Using the supplied butt-splice connectors in the kit, strip back the existing battery connection wire, and crimp the extension wires as shown.

Route heavy gauge extension wires, clamping securely away from any moving suspension hardware, using tie-wraps and clamps as shown.

Drill a 3/8′ hole into the running board cavity. Using a fish tape, start pushing the metal tape from the front hole until it protrudes in the rear fender well.

Route the Extension wires avoiding any suspension components, under the PEM. Mount the battery box, and drill another 3/8″ and route wires into the box.

Mount the battery box using the supplied round head hardware, route the wires from the rear, and crimp on terminals and mount on block.

The voltmeter provides a visual indication of battery health. Anything above 13 VDC is good. Picture replacement is faston tab disconnect/reconnect.

We replace the 8 AH AGM motorcycle battery with a higher capacity 12 AH battery, or a Lithium battery with a 4 year warranty.

The kit includes, Battery Enclosure with Meter, 12′ of heavy 30 AMP stranded wire, two butt splice connectors, two terminal lugs, cable clamps, a 12 Volt 12 Amp Hour sealed no maintenance battery, tiewraps. Tech support is available for DIY installation.

Tesla Service Center

Gruber Motor Company is an independent Electric Vehicle Service Center specializing in Tesla vehicles, with extensive experience in the diagnostics, repair, maintenance, and restoration of Tesla electric vehicles.

As electric vehicles continue to transform the automotive industry, servicing them requires a new kind of expertise. Today’s advanced EV service centers increasingly combine traditional automotive repair with the capabilities of an electronics and engineering laboratory. Gruber Motor Company brings decades of experience servicing critical power systems, high-voltage electronics, battery systems, and power conversion equipment—technologies that share many of the same fundamentals found in modern electric vehicles.

Operating from our 18,000-square-foot service facility in Phoenix, Arizona, our engineers and technicians provide advanced EV diagnostics and repair while maintaining the personalized customer service of a traditional specialty automotive shop. We are particularly known for our expertise with the original Tesla Roadster, including battery systems, power electronics, diagnostics, component repair, restoration, and vehicle preservation.

In addition to specialized Tesla and EV services, Gruber Motor Company provides complete automotive support, including tires, brakes, suspension service, detailing, paint correction, powder coating, paint protection film (clear bra), cosmetic restoration, and vehicle upgrades.

Whether your Tesla requires routine maintenance, advanced electrical diagnostics, battery or power-electronics repair, or a comprehensive restoration, our goal is simple: provide knowledgeable service, clear communication, and solutions that keep these pioneering electric vehicles on the road.

We are proud of our EV Service Center of the Future

Our EV Lab is where Software and Electronics repairs take place

Gruber Motor Company
203 West Lone Cactus
Phoenix, Arizona 85027
EV@GRUBER>COM

602-863-2655 X500

Gruber Motors
0