13502749 Micro Relay, 12V 4-Pin SPST (Micro ISO 280) — Compatible with Chevrolet/GMC/Buick/Cadillac Accessory-Power/Rap/Power-Outlet Circuits — Cross Ref 13502752 (Family: 13502750/13502751/13502753)

What it is: GM-style micro relay, 12V DC, 4-pin SPST, plug-in (Micro ISO 280 footprint). Designed for accessory-power tasks such as RAP (retained accessory power) and 12V power outlets where specified by your vehicle.OE references: 13502749 (4-pin). Commonly cited successor: 13502752 (4-pin). Related family numbers that may appear in the same fuse block: 13502750/13502751/13502753 (verify pin layout and function before use).Typical locations: Interior fuse/relay block near the driver’s knee; under-hood fuse/relay center. Always confirm the exact cavity using the fuse-box legend and your service/owner manual.Typical symptoms: 12V outlets inoperative on ACC/ON (RAP circuit issue), or window circuit not powering even though fuses check out. Replace the specified relay after testing.Installation notes: Disconnect the negative battery cable. Pull the old relay straight out, align pins, and seat the new relay fully. Inspect terminals for heat or corrosion and replace damaged components.Fitment confirmation: Match your vehicle’s OE number and the relay’s 4-pin layout. Use the fuse-box label or service diagram to ensure the correct position and function.

• Specs & OE refs — 12V DC micro relay, 4-pin SPST plug-in (Micro ISO 280 footprint); typically listed at up to 35A by sellers. Cross/related GM OEs commonly seen with this form factor: 13502749 (4-pin), 13502752 (4-pin, commonly referenced as a newer number), family numbers 13502750/13502751/13502753 (verify pin layout before ordering). Match pin count and cavity before use
• Operation & install location — Compatible with GM applications where a 4-pin micro relay is specified for accessory-power functions. Typical locations include the interior fuse/relay block by the driver’s left knee (often used for a RAP/“retained accessory power” relay) and the under-hood fuse/relay center. Pull the old relay straight out, seat the new relay fully; disconnect 12V negative terminal before service; confirm cavity label with the owner’s manual.
• Symptoms this relay addresses (examples) — Compatible with cases where a failed accessory-power micro relay causes 12V power outlets to be inoperative (RAP circuit) or where window circuits rely on a similar micro relay in the fuse box. If your aux sockets don’t power on with ignition/accessory or power windows stop working while fuses are OK, inspect the specified relay cavity and replace as needed.
• Compatibility guidance (how to confirm fit) — Compatible with select Chevrolet/GMC/Buick/Cadillac vehicles that explicitly call out GM 13502749 or its listed successor 13502752 for a 4-pin micro relay slot. Examples documented in owner/forum/service discussions include: Compatible with 2017 Chevrolet Volt RAP relay (driver’s-knee fuse panel) and Compatible with Chevrolet Express 3500 window-circuit relay (under-hood fuse box). Always match your OE number, pin count, and fuse-box legend.
• Complementary items (for a complete fix) — Compatible with maintenance where related micro relays are serviced together (e.g., 5-pin companion in the same block, often sold under GM family numbers like 13502750/13502751) and with service of fuse-box assemblies where some relays are PCB-integrated. If heat damage or corrosion is present, also inspect the fuse block and nearby multi-purpose relays (e.g., later GM multi-purpose relay families) for replacement.