SHIRE / Relays & controllers
Truck wiper relays: sourcing different references without guessing
Use SAP-S150, SAP-S155 and SAP-S156 to prepare an OE-led inquiry where matching 24V or 6P notes do not prove equivalence.
Buying a truck wiper relay by voltage alone can leave an important version distinction unresolved. SAP-S150 shows 7P and 24V in the supplied record; SAP-S155 and SAP-S156 show 6P and 24V but have different OE numbers. A buyer can use these records to identify what to ask, not to decide that the two 6P units are interchangeable.
Identify the original unit before choosing a candidate
Take the complete marking from the requested relay or a reliable purchasing record and keep a readable label photo. Associate one candidate SAP SKU with each requested reference. Do not use the same voltage as a reason to drop OE distinctions. If the number is unreadable, request identification evidence rather than fill the line with a guessed common item. Customer symptoms are not a substitute for a confirmed component reference.
Treat matching connector counts as incomplete evidence
Request the proposed unit’s connector and relevant function documentation. The same 6P note does not establish terminal assignments, interval behavior or motor-system compatibility. A 7P/6P difference must also remain visible in the inquiry. Technical review and installation are for qualified personnel using the right documentation. Do not operate an unidentified unit to infer its pinout or promise that a pictured relay fixes a specific fault.
Keep the approval scope documented
If samples are discussed, specify the exact SKU, sample identity and features that need review. Distinguish a marking/connector review from any qualified functional validation. Ask separately about sample cost and availability. Save approved differences and unresolved matters so they are not lost when the RFQ becomes a quotation. A sample decision does not establish reliability for every future batch without the agreed checks.
Carry the full version into the warehouse record
Before ordering, compare supplier SKU and OE detail against the requirement and state quantities by exact item. Define legitimate label information and any need to separate similar relays in storage. At receiving, check the delivered reference against the final agreed version; do not merge S155 and S156 stock based on matching 6P/24V remarks. Commercial remedies and technical acceptance follow the agreed procedure and terms.
Purchasing guidance, not installation or diagnostic instructions. Confirm compatibility and specifications with the supplier and a qualified technician.
Catalog examples — not confirmed substitutes
SAP-S150
Wiper relay
OE references: 1387022 / 1475750 / 1543806
Catalog specifications ↗
SAP-S155
Wiper relay
OE references: 1523612 / 1741091
Catalog specifications ↗
SAP-S156
Wiper relay
OE references: 1923989
Catalog specifications ↗Compare the actual catalog records
These are current catalog examples, not an approved substitution list. OE references and remarks below are reproduced from the supplied records; they do not establish compatibility, stock or electrical performance.
Editorial note: this purchasing guide was prepared with AI assistance using the supplied catalog and document-coordination scenarios. It is not a product test, technical approval or a promise of SHIRE order terms.
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