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This guide is for auto electricians and vehicle owners needing to control auxiliary electrical systems. The High Tech Parts PR03 Pearl Relay Unit provides a robust 12V, 15A twin output solution for accessories, simplifying complex wiring. A key caveat is that it requires fitting by a qualified auto electrician due to its specific application and integration needs.
| Series | Pearl Relay Unit |
|---|---|
| Model Part Number | PR03 |
| Brand | High Tech Parts |
This relay must be fitted by a qualified auto electrician due to its specific integration into vehicle electrical systems.
The relay is designed for standard 12-volt DC automotive electrical systems.
It provides two 15 Amp outputs, suitable for many common automotive accessories. However, accessories drawing more than 15A per circuit will require a different solution or a lower-rated accessory.
It means the relay can switch and power two separate electrical circuits simultaneously from a single control signal.
The pins are 30 (power input), 85 (ground for coil), 86 (power for coil/trigger), 87 (output 1), and 87a (output 2).
No, due to the requirement for professional installation by a qualified auto electrician, it is not recommended for DIY users.
The product is sold individually, meaning you receive one unit per purchase.
Verify the 12V power supply to pin 30 and the trigger signal to pin 86. Ensure pin 85 is properly grounded. Check that the accessories themselves are functional and not drawing excessive current.
Confirm wiring to both pin 87 and 87a. Check the current draw of the non-functional accessory; it may be exceeding the 15A limit, causing the relay or fuse to protect the circuit. Ensure the accessory is correctly wired.
Check the trigger circuit connected to pin 86. Ensure it is only receiving power when intended and not due to a short circuit or a faulty switch.
This may indicate a current overload on one or both circuits. Immediately disconnect power and verify that the connected accessories do not exceed the 15A rating per output. A faulty relay could also be the cause and may need replacement.
Setup: Installation of the Pearl Relay Unit PR03 must be performed by a qualified auto electrician. The unit requires correct connection to the vehicle's 12V power supply, an appropriate trigger signal (e.g., from an ignition circuit or existing switch), and the two separate accessory circuits it will control. Ensure all connections are secure and correctly wired to pins 30, 85, 86, 87, and 87a as per the circuit diagram.
Compatibility: This relay is designed for 12-volt DC automotive electrical systems. Its specific application is within the accessory market, making it suitable for adding features like extra lighting, audio equipment, or auxiliary power outlets.
Care: As a workshop consumable, the relay is designed for durability. However, proper installation is crucial for longevity. Ensure the relay is protected from excessive moisture and vibration. Regular checks of connected accessory loads should be performed to ensure they do not exceed the 15 Amp rating per output circuit.
