What it is: 12V DC, 35A, 5-pin SPDT micro-ISO relay (Micro 280). Terminals: 30, 85, 86, 87, 87a. Plug-in mount; continuous duty.
Direct OE numbers: 13502751; supersession path 19116058 → 13500126. Common equivalents used by manufacturers: D1780C, 15-50448, 19115082.
Where it goes: Underhood fuse/relay center or interior/body fuse panel (check lid legend for the exact cavity name/position).
What it controls: Fuel pump prime/run, radiator/condenser fan, A/C compressor clutch, power door locks, daytime running/headlamp/fog circuits, wiper motor, and other high-current switched loads (vehicle-dependent).
Fixes: No-start/no-prime, fans not engaging, inoperative lights/locks, intermittent clicking from the relay block, or melted/weak contacts.
Verify before install: Match the part number and the 5-blade layout (with 87a). Confirm your block accepts Micro 280 relays and that the cavity calls for SPDT (not 4-pin).
Package includes: 1 × 13502751 relay (no bracket). Installation takes minutes—disconnect battery, pull old relay straight up, seat new relay fully.