Overview
Connecting the HPVM or HPVM Pro to your vehicle is straightforward. This article covers all wiring connections, mounting options, and best practices for a clean, reliable installation.
Pin Connections
Both models use a removable Phoenix-style terminal block on the back of the unit, making it easy to pre-wire before plugging in. The terminal block layout differs between the two models:
- HPVM: 4-position Phoenix terminal block on the back: 12V power, Ground, Channel 1 (the same 12V power line by default), Channel 2 (optional second voltage input).
- HPVM Pro: 6-position Phoenix terminal block on the back: 12V power, Ground, plus four independent channel inputs (Channels 1 through 4).
Important: The unit measures the voltage between each channel input and the Ground pin. On the standard HPVM, Channel 1 is wired in parallel with the 12V power input by default, so out of the box the unit reads its own supply voltage on Channel 1.
Wiring the Connector
The connector block slides off the unit so you can attach wires before installation:
- Strip approximately 6-8mm of insulation from each wire.
- Insert each wire into the appropriate terminal slot and tighten the retaining screw firmly.
- Use heat-shrink ring terminals on any bare wire ends connecting to battery posts or bus bars for a clean, corrosion-resistant finish.
- Once all wires are secured in the connector, plug the connector back into the unit.
Mounting Options
The HPVM and HPVM Pro include mounting tabs on both the side and bottom of the unit, giving you flexibility in placement:
- Dash or A-pillar mount: Use the side tabs and self-tapping screws or a custom bracket.
- Surface mount: Apply double-sided tape to the base of the unit for a temporary or semi-permanent installation.
- Panel integration: The unit's compact footprint fits into many custom panel cutouts.
Choose a location where the display is clearly visible while driving. Avoid placing the unit where direct sunlight will wash out the screen.
Monitoring Multiple Voltage Sources (HPVM Pro)
The HPVM Pro supports up to four independent voltage inputs, allowing you to monitor multiple points in your electrical system simultaneously, for example, front battery, rear battery, alternator output, and amplifier supply.
- Connect the 12V power and Ground terminals to your main power source. The unit boots from this.
- Connect each Channel input (1 through 4) to the voltage source you want that channel to read.
- The HPVM Pro displays all active channels independently, allowing real-time voltage comparison across your system.
Channel labeling on the Pro: Wire each channel by its silkscreen label. The HPVM Pro displays channels in silkscreen order on screen even though the internal ADC numbering differs.
Each channel's calibration drift can be adjusted individually in the AuralSync app.