Product Description
Aurora Design FMR-HV1 High Voltage Relay Driver for Wonderbar® Seek Relays
The FMR-HV1 is a small add-on module that lets Aurora Design's FMR-3.2 receiver work with the high-voltage seek relays used in Delco® E- and F-Series Wonderbar® and similar signal-seeking radios. Many late-1950s Delco® Wonderbar® radios used a seek relay that needs far more voltage than a modern circuit normally supplies. The FMR-HV1 provides that voltage so the original signal-seeking mechanism works as designed.
How It Works
The FMR-HV1 is a current-limited supply that works with both low-impedance and high-impedance relays. Its 52V open-circuit output lets even high-impedance relays operate normally, so you don't have to weaken the relay's return spring to make it pull in. That keeps the original seek mechanism adjusted the way the factory intended.
Quiet on the AM Band
Some competing supplies switch at 20-40kHz, which can spread noise across the AM band. The FMR-HV1 uses an automotive switching regulator running at 2MHz. Because that frequency is above the AM band, the FMR-HV1 can't interfere with AM reception, which is important in a radio built to pull in distant AM stations.
Easy to Install
- Fully self-contained, with no external components
- Wires directly between the FMR receiver and the seek relay
- Very small and efficient, so it mounts almost anywhere inside the radio
- Designed to SAE specifications
- Designed and built in the USA in an ISO 9001:2000 facility
Part of the FMR-3.2 System
Aurora Design lists the FMR-HV1 as an optional accessory for the FMR-3.2 AM/FM receiver. The FMR-3.2 fully supports signal-seeking radios, including Wonderbar®, Town & Country and Electro-Touch. Press Seek once for the next station, or twice to scan with an 8-second pause on each. The receiver's own seek relay output is a 60V inductive driver rated at 1.0A with short-circuit protection. For Wonderbar® designs that need the higher-voltage relay, the FMR-HV1 is the matching part.
Related Aurora Design Options
If your signal-seeking radio has worn limit switches or relay contacts, look at the FMR-MC1 Motor Controller, which drives the seek motor directly and removes the original limit switches and relays. Six-volt and positive-ground cars also need the HPC-1 High Power Voltage Converter to run the FMR-3.2.
Who Needs One?
You need the FMR-HV1 if you are converting a Delco® E- or F-Series Wonderbar®, or a similar radio with a high-voltage seek relay, using an FMR-3.2. Most manually tuned radios and many other signal seekers don't need it.
Sold and shipped by Vintage Car Radio. Contact our team with your radio's model number if you're not sure your Wonderbar® uses the high-voltage relay.
FMR-HV1 High Voltage Relay Driver FAQ
Do I keep my original radio face?
Aurora Design's FMR-3.2 goes inside your original radio chassis. The dash still shows the factory radio face.
What speakers will it drive?
Aurora Design rates the FMR-3.2 to drive modern speakers; check the product description for the exact speaker and power guidance for your install.
Do I need a voltage converter?
The FMR-3.2 runs on about 8.5–16V DC. For 6-volt cars, or 12-volt positive-ground cars, Aurora Design specifies the HPC-1 high-power converter.
Is this made in the USA?
Aurora Design products are designed to SAE specifications and built in the USA in an ISO 9001 facility.
Call-in install only — not sold as a ship-to-you part.
These Aurora Design units are installed here at Vintage Car Radio. Send your radio to us and we install the board or adapter in your unit. This listing is for information only: prices are not shown online, and you cannot add it to the cart.
To arrange an install, call us at 574-226-6676 or email sales@vintagecarradio.com.
FMR-HV1 High Voltage Relay Driver specifications
- Aurora Designs product as titled
- See the product overview above for features, fitment, and included parts
- 12V negative-ground automotive use unless the overview states otherwise
Wiring / Tech Tips — FMR-HV1 High Voltage Relay Driver
- Disconnect the battery negative before installing.
- Confirm fitment (year/model, dash opening, polarity) against the title and overview.
- Follow the manufacturer wiring diagram packed with the unit; use a fused 12V switched lead and a solid chassis ground.
- Test all functions before reassembling the dash.
Vintage Car Radio does not offer installation.
FMR-HV1 High Voltage Relay Driver manuals
- Instructions packed with the unit
- Manufacturer documentation: aurora-designs.com
Warranty
Covered by the Aurora Designs manufacturer warranty as published by aurora-designs.com. For warranty or service questions, contact Vintage Car Radio at 844-802-4499 / 574-226-6676.
FAQ — FMR-HV1 High Voltage Relay Driver
Will this fit my vehicle?
Match the title and overview; call 844-802-4499 if unsure.
Do you install?
No.
Need help?
844-802-4499 / 574-226-6676.
Specs
Wiring / Tech Tips
Manuals
Warranty
Warranty
Covered by the Aurora Designs manufacturer warranty as published by aurora-designs.com. For warranty or service questions, contact Vintage Car Radio at 844-802-4499 / 574-226-6676.
