The 1957 Triumph TR3 has one listed electrical switch & relay part: a Horn Relay from STANDARD MOTOR PRODUCTS, covering the 2.0L L4 — the only engine offered in the 1957 Triumph TR3. It includes a manufacturer part number and application notes.
On the 1957 Triumph TR3, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
The part number opens a page with every vehicle that part fits.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | HR106 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the relays that control the Horn circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
One part is listed for the 1957 Triumph TR3 — STANDARD MOTOR PRODUCTS HR106.
Buying Electrical Switch & Relay Parts for a 1957 Triumph TR3
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Confirm you have the 2.0L L4 engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Horn Relay .
Frequently Asked Questions
How many electrical switch & relay parts fit the 1957 Triumph TR3?
This page lists one electrical switch & relay part for the 1957 Triumph TR3: a Horn Relay from STANDARD MOTOR PRODUCTS, covering the 2.0L L4 engine.
What are the signs of electrical switch & relay problems on a 1957 Triumph TR3?
Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1957 Triumph TR3 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1957 Triumph TR3?
Every part on this page is matched to the 2.0L L4 engine. Then swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1957 Triumph TR3
Electrical Switch & Relay Parts for Other Triumph TR3 Years
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