A relay is easy to overlook because it is usually small, inexpensive, and hidden in a fuse box or auxiliary bracket. But on a high-current circuit, replacing it by shape alone is a gamble. The buyer-friendly question is simple: does the replacement match the circuit's current demand, pin layout, coil protection, mounting style, and service information?

Bosch 0332002159 is a power relay Parts Universe carries for shoppers who need a 12 V, 100 A, normally-open relay. Bosch's relay catalog places part number 0332002159 in its 12 V normally-open power-relay section and lists it as a 4-pin, resistor-coil relay with a mounting bracket and 100,000-cycle lifetime entry.

What Parts Universe lists

Parts Universe currently lists this item as Bosch 0332002159 Normal Open Power Relays, 12 V, 100 A, 4 Contacts, Resistor. The active Shopify product record verified for this article shows:

  • Parts Universe SKU: BSH-0332002159
  • Manufacturer part number: 0332002159
  • Barcode: 03165141212778
  • Current Parts Universe price: $32.99
  • Current inventory: 92 units
  • Current status: active and available for sale

What Bosch verifies

Bosch separates relay families by job size. Its public relay information describes power relays as products used for switching operations in engines, starters, and other large consumers. In Bosch's relay catalog table, 0332002159 appears under 12 V NO power relays with these key attributes:

  • Product family: power relay
  • Part number: 0332002159
  • Current: 100 A
  • Number of pins: 4
  • Coil connection: resistor
  • Mounting bracket: yes
  • Catalog lifetime entry: 100,000 cycles

When a 100A power relay makes sense

This is the kind of relay to consider when the original circuit was designed around a high-current power relay, not a small micro relay or generic accessory relay. Typical buyer situations include replacing a missing or failed relay where the original part number, service manual, or relay markings call for the same Bosch number or matching electrical specification.

Do not upgrade to a higher-current relay as a shortcut for a wiring problem. A 100 A rating only helps when the rest of the circuit is designed for that load: wire gauge, fuse protection, connectors, terminals, mounting, heat, and duty cycle all still matter.

Five checks before ordering

  1. Match the part number first. If the removed relay is Bosch 0332002159, this listing is the direct product to review. If it is a different number, confirm a documented cross-reference before substituting.
  2. Confirm 12 V normally-open operation. A normally-open relay behaves differently from a changeover relay, latching relay, or normally-closed relay.
  3. Count the pins and compare the diagram. Four pins are not enough by themselves; terminal numbers and the circuit diagram must also match.
  4. Check coil protection. Bosch lists this part with a resistor coil connection. Do not swap resistor and diode-protected relays casually in electronically controlled circuits.
  5. Check mounting. Bosch lists a mounting bracket for this part. That matters when the relay is secured near vibration, heat, or service access points.

Safety notes for relay replacement

  • Disconnect the battery when the service procedure calls for it; Bosch's relay-change guidance specifically warns about preventing discharge and short circuits.
  • Do not bypass a relay socket with wire or tools to "see what happens" on a high-current circuit.
  • Inspect terminals for heat discoloration, looseness, corrosion, or melted plastic before installing the new relay.
  • Replace damaged sockets or terminals instead of relying on the relay to mask poor contact.
  • If the fuse opens again after relay replacement, diagnose the load and wiring before installing another relay.

Good fit, bad fit

Good fit: your service information or original relay calls for Bosch 0332002159, a 12 V normally-open 100 A power relay with 4 pins, resistor coil protection, and a mounting bracket.

Bad fit: you only know the relay is black, square, or has four terminals. Relay housings can look similar while the internal circuit, coil protection, and current rating are different.

Related Parts Universe links

Bosch 0332002159 is a practical choice when the spec sheet, original relay, and circuit design all point to the same high-current relay. Match the number, verify the circuit, and treat any heat-damaged socket as part of the repair instead of an unrelated detail.