Every long-standing trade account we have started with a sample order. It is the cheapest risk control available in the aftermarket, and it takes very little time to do properly.
Order the exact reference you intend to stock
Testing a convenient substitute tells you nothing about the reference you will actually sell. Order the same OE number, from the same brand line, that your bulk order will be built from.
Check the mechanical fitment first
Before any electrical testing, confirm the part physically mounts. Mounting points, pulley alignment and connector shape are what cause returns, and they are visible without a test bench.
- Mounting holes line up with the original bracket
- Pulley diameter and groove count match the belt
- Electrical connector engages fully and locks
- Overall envelope clears adjacent components
Then test it under load
A bench test at load tells you more than a no-load spin. Record the reading so you have a baseline to compare against the bulk shipment when it arrives.
Keep the sample
Once verified, keep the sample as your reference unit. Comparing an incoming container against a known-good unit is quick, and it catches packing or labelling drift before it reaches your customer.
Have a part number to price?
Send it over with the quantity and destination. You will get a fitment check, a unit price and a freight cost — usually the same business day.