What are the specs for this Wiring Harness?

The correct replacement for Goodman model GMP075-4 — B1378700 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Goodman equipment which lists the model number GMP075-4 — B1378700.

What symptoms indicate I need a new wiring harness?

Common symptoms that indicate you need a new wiring harness include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

Is this wiring harness compatible with Bryant or Payne systems too?

Many Goodman parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

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Goodman

OEM Goodman 16-Pin Wiring Harness for GMP075-4 — B1378700

Name: OEM Goodman 16-Pin Wiring Harness for GMP075-4 — B1378700
Brand: Goodman
SKU: GOODMAN-11855
Price: 18.95 USD
Availability: InStock

SKU: GOODMAN-11855 Brand: Goodman

$18.95 $24.95

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Goodman B1378700 16-Pin Wiring Harness

The Goodman B1378700 is a genuine OEM 16-pin wiring harness engineered as a direct-fit replacement for the GMP075-4 gas furnace. This multi-pin connector loom links the integrated furnace control board to the blower, limit switches, gas valve, and ignition circuit, delivering reliable low-voltage signal transfer throughout the appliance. Over years of thermal cycling, factory harnesses can develop brittle insulation, corroded terminals, or a cracked connector housing that produces intermittent no-heat faults and error codes — replacing the harness restores clean, stable connections.

Specifications

Part Number: B1378700
Connector: 16-pin plug
Fit: Goodman GMP075-4 gas furnace
Type: Low-voltage control wiring harness
Brand: Goodman OEM

OEM vs. Generic

This is the genuine Goodman OEM harness, built to exact factory pin-out, wire gauge, and connector keying so it seats correctly the first time with no splicing or re-pinning. Aftermarket universal harnesses often require cutting and crimping, risk mismatched pin assignments, and can void equipment warranties. For guaranteed compatibility and a plug-and-play install, the OEM part is the safe choice.

Installation Difficulty

Moderate. Requires disconnecting power at the breaker, removing the furnace access panel, and unplugging/re-seating keyed connectors. Photograph existing routing before removal. Most experienced DIYers complete the swap in 20–30 minutes; if you are unsure, consult a licensed HVAC technician.

Always shut off electrical power and gas supply before servicing your furnace.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Goodman 16-Pin Wiring Harnes...

$18.95

Frequently Asked Questions

Does this Wiring Harness fit my Goodman GMP075-4 — B1378700?

Yes. This is the factory-specified OEM wiring harness for the Goodman GMP075-4 — B1378700. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the wiring harness on my Goodman GMP075-4 — B1378700?

Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.

What symptoms mean I need a new wiring harness?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this wiring harness compatible with Bryant or Payne too?

Many Goodman parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Goodman wiring harness?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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