Custom Relay Panels

We build custom relay panels to suit a wide variety of applications. You provide the specifics, we provide a panel to make it happen. Shown here are just a few of the many we’ve built! There really isn’t much we can’t build when it comes to custom relay panels. For dozens more examples of our work, visit our Facebook page.

Contact Us directly for specifics in building a panel for your application if you don’t see it here.

Click on any of the pictures to view a high resolution version.

Stern Custom Relay Box
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We built this power center for a gentleman that is converting a vintage Fiat from gas to electric power. The OEM wiring harness leaves a lot to desire, so he did a complete layout on a rework on his PC.

He supplied his drawings, the project boxes and some of the relays and sockets. We turned his concept into reality. Note how we terminated everything with plugs so that we can build custom harnesses for each of the accessories when the project is further along. This is one of two such boxes for this project.

Wow that is amazing looking! – Dustin, Manassas, VA

SS RockCrawler Power Panel
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We built this relay/power center for a local customer building a custom rock crawler. He supplied us with the aluminum panel with a panel mounted circuit breaker (on the right) already installed. The fuse panel on the left is similar to the one he is using for his EFI ECU so we used it to mock up the component layout.

Note the use of waterproof relays so that this buggy can go nearly anywhere without worry of damage to the electrical system.

Awesome! It’s exactly what I wanted but would have a hard time executing myself. – Shawn, Mesa, AZ

Dodge Power Center
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We built this power center for customer that purchased both of our automotive wiring books at his local book store and then looked us up for some parts for his project.

This panel offers fused outputs for accessories that require constant power, those that need be switched on with the key in the Accessory position, and those that need be switched on with the key in the Run position. In addition, it offers two 30 Amp relay switched outputs.

After reading your books, I will never ever again have spaghetti under my dash. This came out simply awesome! – Kyle, Slidell, LA

Ford Mustang Cobra Power Center
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We built this power center for a customer with a 1997 Ford Mustang Cobra that has a bunch of aftermarket accessories and needed a place to conveniently source power for them.

This panel offers fused outputs for accessories that require constant power, those that need be switched on with the key in the Accessory position, and those that need be switched on with the key in the Run position. In addition, it offers a convenient place to tie all of the lighting circuits for his aftermarket gauges as well as a grounding stud.

Panel works and looks awesome! – Robert, Granada Hills, CA

Cody's Panel
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So, you’re a car audio fanatic and you’ve got as many amplifiers as The Who toured with in the ’70s. In addition, you’d like the utmost in control. No problem. You dream it up, and we can build it!

Shown here is a relay panel we built for a DC Audio factory rep in Florida. It allows him to control the output of multiple 4-channel amplifiers for both driving and show modes.

Just got home and got the panel and let me say this is an absolute work of art! It works flawlessly! – Cody, Panama City, FL

68 Ford Mustang Fuse Panel
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We built this panel for a customer with a 1968 Ford Mustang with a 440 ci SBF that is building a nice little street/strip vehicle. The vehicle is equipped with a Moroso switch panel. This panel allows the Moroso switch panel to activate relays to switch far higher current to the accessories than the switches are capable of.

This panel has six relays, which will be used for two electric fans, two electric fuel pumps, an electric water pump, and one spare.

Power Panel for 56 F100
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We built this panel for a 1956 Ford F100 truck. This panel has relays for a pair of power windows, a pair of door popper solenoids, and the light flash circuit in the door popper controller.

Our longtime and excellent customer Bill (who owns the 55 Ford Customline) is doing a complete electrical makeover for this old Ford. This panel is but the tip of the iceberg for the F100.

7-Relay Panel KIt
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This Custom Relay Panel Kit includes:

  • (7) Relays
  • Fuse Panels for +12V Constant and +12V Switched Accessories
  • Custom 4 AWG Power Lead
  • MAXI Style Fuse Holder (FHMAXI)

This kit greatly simplifies a fairly complex installation.

6-Relay Power Panel Stein
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This Custom Relay Panel Kit includes:

  • (6) Relays in Sockets
  • (1) 100 Amp Solenoid (SOL100) – powers Ford 18″ fan
  • Fuse Panels for +12V Constant and +12V Switched Accessories
  • Fan Control Circuit with Auto / ON / OFF switch and thermostat
  • 8 AWG Fan Harness with 8 AWG Anderson Connectors
  • Motorized Headlight Circuit (UP / DOWN) with switch
Waterproof Relay Panel
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This Custom Relay Panel Kit includes:

  • Integrated H4 Headlight Relay Kit
  • (3) Additional Waterproof Relays in Sockets
  • +12V Constant Fuse Panel
  • Custom 4 AWG Power Lead

Just Opened the Package – beautiful! The quality of material and craftsmanship is top shelf – thank you! – Dean, Madison, IN

65 Dodge Coronet Relay and Switch Panel
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We build this kit for a ’65 Dodge Coronet with a big wedge motor.

This Custom Relay Panel Kit includes:

  • Dual Tyco 40A Relays to feed a BIG fuel pump
  • (4) Tyco 30A Relays – cooling fan, trans cooler fan, water pump, etc.
  • Matching 5-position switch panel with illuminated switches and harness.
  • The switch panel is sized to fit the stock radio opening in the Coronet.

NEW! Choose A Custom Relay Panel That’s Right for You!

6- and 7-Relay Panels are our most popular requests. Each takes between 2 to 3 business days to build.

Generally speaking:

  • Total current capability of any of the below is 150 Amps between ALL circuits
  • Main Fuse Panel to be supplied via 4 AWG Cable to minimize voltage drop (sold separately)
  • Main Fuse Panel has (3) spare +12V constant fused outputs on 6 Relay Panels and (2) spare +12V constant fused outputs on 7 Relay Panels
  • Switched Fuse Panels afford the convenience of connecting low current circuits that you’d like activated only with the key in the RUN position – 6 individual fused outputs are provided
  • Switched Fuse Panels have a total current capability of 40 Amps between all circuits
  • Fuse Panels accept ATC Fuses (sold separately) which are widely available
  • Relay Sockets add convenience to easily remove/swap relays should that be necessary. We crimp and solder all of the high current connections in sockets to minimize voltage drop through them!
  • 10 AWG TXL is used for all high current switch connections to the relays to minimize voltage drop
  • 18 AWG GPT is used for all low current coil connections to the relays
  • Panel wiring is color-coded to simplify installation:
    • 6 Relay Panels utilize Blue, Green, Brown, Yellow, Orange, and Gray
    • 6 Relay Panels with Switched Fuse Panel utilize Pink (to the Switched Fuse Panel), Blue, Green, Brown, Yellow, Orange
    • 7 Relay Panels utilize Blue, Green, Brown, Yellow, Orange, Gray, and Violet
    • 7 Relay Panels with Switched Fuse Panel utilize Pink (to the Switched Fuse Panel), Blue, Green, Brown, Yellow, Orange, Gray
    • Matching TXL and GPT Wire in Automotive Primary Wire.

Click on any of the pictures to view a high resolution version (Note: Photos are for illustrative purposes.)

Power Panel for 56 F100
Relays wired with Push-On terminals
7-Relay Panel Sockets
Relays Wired with Relay Sockets
7-Relay Panel with Switched Fuse Panel
Includes Switched Fuse Panel

All Assembled on 1/4″ Thick ABS Plastic Panel

6-Relay Panels

7-Relay Panels

Optional Power Lead

Call Us Directly for Quotes On:

  • Panels with Waterproof Relays (to be used under hood)
  • Power Centers in NEMA Waterproof Enclosures
  • Panels with varying numbers of relays / fuse panels
  • Panels with custom harnesses in lieu of terminal blocks
  • Custom Switch Panels to control Relay Panels
  • Etc.