Recall 25V663 covers 278 2022-2025 Altec ST600 vehicles for overloaded auxiliary-engine electrical circuits. Turn battery disconnect off. Free repair once Altec opens the final repair.
Altec is recalling 278 2022-2025 ST600 vehicles with auxiliary engines because the auxiliary engine electrical circuit, including the starter and voltage regulator, can become overloaded. An overloaded circuit can overheat and raise the risk of fire; the dealer repair will be free once Altec opens the final remedy.
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What's wrong?
The auxiliary engine on 2022-2025 Altec ST600 vehicles powers work equipment separate from the main vehicle engine. Its electrical circuit connects components such as the starter and voltage regulator, which help start the auxiliary engine and control charging voltage so the electrical load stays within the parts' designed limits.
On affected ST600 vehicles, that auxiliary engine circuit can become overloaded. The starter, voltage regulator, and related wiring can draw more current than the components are rated to handle, which generates heat. Altec's investigation tied reported thermal events to the auxiliary engine electrical components, including electrical arcing seen at the voltage regulator.
The updated circuit separates the auxiliary engine electrical components from the chassis charging system. That change keeps the auxiliary engine from being exposed to electrical activity beyond its capacity. There is no warning sign before failure.
Who's affected?
Four ST600 model years are tied to the same wiring schematic.
| 2025 Altec ST600 | wiring |
|---|---|
| 2024 Altec ST600 | wiring |
| 2023 Altec ST600 | wiring |
| 2022 Altec ST600 | wiring |
| Units affected | 278 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether this recall applies to your specific vehicle.
What's the safety risk?
Overloaded circuits can overheat and raise the risk of fire. There is no warning sign before failure. Until the final repair opens, follow Altec's shutdown instructions and turn the battery disconnect off as directed. Repair will be free at any franchised Altec dealer once Altec opens it.
What should I do?
- Check your VIN to confirm your 2022-2025 Altec ST600 is included in this recall.
- Wait for Altec's final remedy letter before scheduling the electrical-circuit replacement; the final repair is free once Altec opens it.
- Follow Altec's interim shutdown instruction: turn the battery disconnect off when shutting down the vehicle.
- Contact Altec customer service at 1-877-462-5832 with questions and reference recall number 25V663 (Altec recall CSN-3257).
What happens at the repair
Until the final repair is available, follow Altec's interim shutdown procedure and turn the battery disconnect off after use. Once Altec opens the final remedy, an Altec technician will replace the overloaded auxiliary engine electrical circuit, including the starter and voltage regulator circuit parts covered by the recall. The final dealer repair will be free once available. Altec sent interim safety letters and will send additional owner letters when the final remedy opens.
Timeline
| October 3, 2025 | NHTSA published the recall |
|---|---|
| November 21, 2025 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 25V663?
Recall 25V663 covers 278 2022-2025 Altec ST600 vehicles equipped with auxiliary engines. The auxiliary engine electrical circuit, including the starter and voltage regulator, can overload, overheat, and increase fire risk. Altec will replace the electrical circuit for free once the final remedy is available.
What should I do if my 2022-2025 Altec ST600 is on this recall?
Check your VIN to confirm your specific ST600 is included in recall 25V663. If it is, follow Altec's interim shutdown instruction by turning the battery disconnect off as part of the shutdown procedure, then contact Altec customer service at 1-877-462-5832 for repair guidance.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to fix the defect at no cost. Altec will replace the affected electrical circuit free of charge once the final remedy is available.
What is the safety risk?
The safety risk is fire. In affected ST600 vehicles, the auxiliary engine electrical circuit can become overloaded. If the circuit overheats, fire risk increases. Until the final repair opens, use Altec's interim shutdown step and turn the battery disconnect off during shutdown.
When will Altec notify owners about recall 25V663?
Altec mailed interim owner letters on November 21, 2025. Those letters warned owners about the safety risk and the interim shutdown step. Altec will send additional letters once the final electrical circuit replacement is available.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/25V663000 |
|---|---|
| Altec customer service | 1-877-462-5832 |
| NHTSA recall # | 25V663 |
| NHTSA recall # (full) | 25V663000 |
Source documents
-
Download Recall Report (PDF) - Download Recall Document (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 19, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →