What are the specs for this Wiring Harness?

The correct replacement for Goodman model GMP100-3 Furnace — 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 GMP100-3 Furnace — 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 GMP100-3 Furnace — B1378700

Name: OEM Goodman 16-Pin Wiring Harness for GMP100-3 Furnace — B1378700
Brand: Goodman
SKU: GOODMAN-11872
Price: 39.95 USD
Availability: InStock

SKU: GOODMAN-11872 Brand: Goodman

$39.95 $52.95

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Goodman B1378700 16-Pin Wiring Harness

The B1378700 is a genuine OEM 16-pin wiring harness for the Goodman GMP100-3 gas furnace. This main harness carries power and low-voltage control signals between the integrated furnace control board and the furnace's components — blower, igniter circuit, limit and rollout switches, and gas valve leads. Melted connectors, chafed insulation, or corroded pins cause intermittent no-heat faults and blower problems, and a factory-terminated harness eliminates the guesswork of splicing individual wires.

Specifications

Part number: B1378700
Connector: 16-pin main harness
Compatibility: Goodman GMP100-3 gas furnace control board
Type: Pre-terminated OEM plug-and-play harness
Fit: Direct replacement — keyed connector

OEM vs. Generic

The OEM 16-pin harness uses the correct keyed connector, wire gauge, and pin assignments so it plugs directly into the Goodman control board with no rewiring. Generic bulk wire and crimp connectors introduce failure points and can miswire the low-voltage circuit. For a safe, code-compliant repair, use the OEM harness.

Installation Difficulty

Moderate (3/5). The connector is keyed and unplugs by hand, but routing and reconnecting each lead correctly takes care. Photograph the original routing first. Recommended for experienced DIYers or an HVAC tech. Always shut off power and gas before servicing.

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...

$39.95

Frequently Asked Questions

Does this Wiring Harness fit my Goodman GMP100-3 Furnace — B1378700?

Yes. This is the factory-specified OEM wiring harness for the Goodman GMP100-3 Furnace — 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 GMP100-3 Furnace — 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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