Applies to: Ecto-1 battery tray (each compartment is marked 4×AAA).Ecto-1 has 2 compartments — repeat this process for both.

Step-by-step

1. Open the battery compartment and remove all AAA batteries (if installed).

2. Locate the tray terminals: find the ends marked (+) and (–) (usually at the far left and far right of the tray).

3. Install only the two end inserts

   • Place Insert #1 on the far end that connects to the (–) terminal.

   • Place Insert #2 on the far end that connects to the (+) terminal.

4. Leave the two middle battery slots EMPTY

   • Do not install batteries or dummies in the two center slots.

5. Critical: terminal contact

   • Ensure each insert’s copper contact is firmly touching the tray’s terminal copper (+ / –).

   • If the copper pad isn’t making contact, the car won’t power on.

6. Route the cable neatly (if applicable) and close the cover carefully (don’t pinch the wire).

7. Power on / test.

   • If nothing happens: reopen and re-seat both end inserts, checking polarity and copper-to-copper contact.

Quick troubleshooting

• No power: 99% of the time it’s contact (insert not pressing on terminal copper) or polarity reversed.

• Intermittent: re-seat and make sure the insert isn’t shifting when the door closes.

Diagram installation

How to identify + / – (IMPORTANT):

• Look at the end walls of the battery tray and find the single exposed metal/copper contact.

• That single metal/copper contact is the terminal contact point your insert must touch.

• Use the tray’s printed (+ / –) marking near that contact to confirm which side is positive or negative.