Humbl Automotive Relay Tester (4-Pin & 5-Pin)
$34.99
$24.99
Stop guessing which relay is bad. The Humbl Automotive Relay Tester gives you an instant go/no-go result on both 4-pin and 5-pin relays — the two most common configurations in modern vehicles.
Connect to your 12V battery (11–15V range), plug in the relay, and the LED indicators tell you everything: contact health, timing, and consistency. Simple, reliable, and essential for any automotive electrical diagnosis.
Compatible with: starter relays, fuel pump relays, horn relays, AC relays, fan relays, and most 12V automotive relays. Available as tester only, or bundled with spare relays and oil funnels.
Quantity
Compatibility
Works with standard 4-pin and 5-pin automotive relays. Compatible with Mercedes-Benz, BMW, Audi, VW, Ford, Toyota, Honda, and most modern vehicles.
How It Works
• Plug the relay into the tester • Connect to 12V (clamps included) • LED indicators show coil activation and contact switching • Instant pass/fail result
Shipping & Returns
Tracked & insured. Every order ships with full tracking — we email your tracking number the moment it dispatches.
Dispatch: Orders are quality-checked and handed to the carrier within 3–5 business days.
Delivery: US orders typically arrive 7–15 days after dispatch. Why the wait? Our parts are designed and quality-audited in the USA and produced through an exclusive supply chain — not pulled from stock vendor shelves.
14-Day Returns: Not right for your build? Return unused items within 14 days of delivery for a refund. Arrived damaged or wrong? Contact us and we'll replace it or refund you — at no cost to you.
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What they’re saying
"The socket set is top-tier quality. Heavy-duty steel that handles real torque without slipping. Better than the big box store brands honestly."
Jason M., Ohio
Ordered brake pads and rotors for my truck. Everything fit perfectly right out of the box. Saved me cash and shipping was surprisingly fast."
Isaac L., Texas
"Incredible service. Needed a specific sensor fast and it arrived a day early. The site is simple to use. Finally found a reliable parts source!"
Mike T., Florida
