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New Holland Timer Relay SBA385870301 TC35 TC45

New Holland Timer Relay SBA385870301 TC35 TC45

SKU:1303

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Regular price $15.99
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12V glow plug timer relay for New Holland TC-series compact tractors. Ensures reliable cold-weather starting by controlling glow plug activation timing. Direct OEM replacement delivering consistent performance and long-lasting durability across a wide range of TC-series models.

Voltage: 12V DC

OEM Part Numbers: SBA385870301 · SBA385870300 · 83965764 · 385870300

Ships same-day on orders placed before 3 PM PST. Free shipping. 30-day returns.

Not sure it fits? Call (818) 261-3896

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COMPATIBILITY

Fits These New Holland TC-Series Tractors

New Holland TC33 / TC33D
New Holland TC35 / TC35A / TC35D / TC35DA
New Holland TC40 / TC40A / TC40D / TC40DA
New Holland TC45 / TC45A / TC45D / TC45DA
New Holland TC48DA
New Holland TC55DA
12V DC System
OEM#: SBA385870301 · SBA385870300 · 83965764 · 385870300

WHAT'S INCLUDED

Everything You Need for Reliable Cold Starts

1× Timer Relay
OEM SBA385870301 specification
🔌
12V DC Rated
Matches factory electrical spec
🔧
Plug-and-Play Install
Connects to factory wiring harness
🛡️
30-Day Warranty
Arko quality guarantee
QC Inspected
Tested before shipping
🚚
Same-Day Shipping
Order before 3 PM PST

WHEN TO REPLACE

Signs Your Glow Plug Timer Relay Is Failing

Replace your New Holland TC-series timer relay immediately if you notice:

⚠️ Hard starting or no-start in cold weather
⚠️ Glow plug warning light doesn't illuminate at startup
⚠️ White smoke on cold starts — unburned fuel
⚠️ Glow plugs not getting power when tested
⚠️ Relay clicks but glow plugs don't heat up
⚠️ Engine cranks excessively before firing in cold temps

CUSTOMER REVIEWS

Trusted by Tractor Owners Nationwide

★★★★★ 4.6 out of 5 stars (927 reviews)
★★★★★
Perfect Fit
VERIFIED REVIEW

"Exact replacement for my Ford 4600. Installed in 20 minutes and tractor fired right up. Quality part at a great price. Will order from Arko again."

Mike T. • Verified Buyer • March 2026
★★★★★
Fast Shipping & Great Support
VERIFIED REVIEW

"Ordered Monday morning, received Wednesday. Called with a fitment question and spoke to someone who actually knew tractors. Part works perfectly on my Kubota."

James R. • Verified Buyer • March 2026
★★★★★
Better Than OEM
VERIFIED REVIEW

"This gasket kit saved me hundreds compared to dealer pricing. Quality is excellent, everything fit perfectly. No leaks after 50+ hours of operation."

David L. • Verified Buyer • February 2026

FAQ

Common Questions

How do I know if it's the timer relay that's faulty and not the glow plugs themselves?

Test each glow plug individually with a multimeter — a functioning plug will show low resistance (typically under 2 ohms). If the plugs test good but still don't heat up during the pre-heat cycle, the timer relay is the likely culprit since it controls whether power reaches the plugs at all. If the relay clicks but plugs still don't heat, also check the wiring between the relay and plugs. At $15.99, the relay is almost always worth replacing first.

My TC40 starts fine in warm weather but struggles in cold — is this a relay problem?

That's the classic symptom of a failing glow plug system. In warm weather, compression alone is enough to ignite the fuel. Below around 40°F, the glow plugs need to pre-heat the combustion chamber for reliable ignition. If the relay isn't activating the plugs properly, cold starts will be difficult or impossible even if the engine is otherwise healthy. Replace the relay first, then test the glow plugs if problems persist.

SBA385870301 and SBA385870300 — are these the same relay?

Yes. SBA385870301 supersedes SBA385870300. Both numbers, along with 83965764 and 385870300, are OEM equivalents for the same 12V glow plug timer relay on New Holland TC-series compact tractors. Any one of those numbers on your existing relay confirms this is the correct replacement.

What's your return policy

We offer free returns within 30 days if the part doesn't fit or you're not satisfied. Parts must be unused and in original packaging.

Do you offer technical support?

Yes. Call (818) 261-3896 and we'll help you confirm fitment, answer installation questions, or troubleshoot issues.

How long does shipping take?

Orders ship same-day if placed before 3 PM EST. Standard delivery is 3-5 business days.

Start Every Morning — Ships Same Day

12V glow plug timer relay for New Holland TC33–TC55DA compact tractors. OEM# SBA385870301, SBA385870300, 83965764. Plug-and-play installation. Free shipping. 30-day returns.

ADD TO CART — $15.99
📞 Questions? (818) 261-3896