GMC C3500 1985-1993 Wiper Arm Replacement Guide
Everything you need to know before replacing the wiper arms on your 1985-1993 GMC C3500 truck.
- Wiper arms are a common wear item; symptoms include skipping, poor contact, and lifting at speed.
- Before replacing arms, rule out the common wiper motor circuit board failure if your wipers are intermittent or don't move at all.
- Replacement is extremely easy and can be done in minutes with no special tools, making it a great DIY task.
- New OEM parts are unavailable; aftermarket reproductions from brands like Motormite (Dorman) or generic 'Replacement' brands are the only options.
Is It Your Wiper Arm or Something Else?
Before you buy a new wiper arm for your GMC C3500, it's important to correctly identify the problem. On these 1988-1993 GM trucks, the most common cause of wiper failure is NOT the arm itself, but a faulty wiper motor circuit board, also known as a pulse board. If your wipers work intermittently, stop in the middle of the windshield, or don't work at all, the problem is more likely the electronics than the mechanical arm. However, if your wipers move but chatter, skip, or fail to make good contact with the glass, a weak or damaged wiper arm is a likely suspect.
Symptoms of a Failing Wiper Arm
- Wiper blade lifts off the windshield: Especially at highway speeds, a weak spring can't provide enough pressure to hold the blade down.
- Streaking or chattering: Even with new blades, if the arm doesn't apply even pressure, you'll get poor wipe quality.
- Arm is visibly bent or cracked: Damage from ice scrapers, car washes, or metal fatigue can compromise the arm.
- Wiper arm won't stay on: The splined hole at the base of the arm can strip out, causing it to spin freely on the pivot shaft.
Choosing Your Aftermarket Wiper Arm
For a truck of this age, new Original Equipment (OEM) wiper arms from GM are generally not available. The market consists of aftermarket reproductions designed to match the original factory specifications. Your main choices will be between branded and unbranded aftermarket parts.
Aftermarket Brand Tiers
| Brand Tier | Examples | Quality & Cost Assessment |
|---|---|---|
| Branded Aftermarket | Motormite (a Dorman brand) | Dorman is a widely recognized aftermarket manufacturer. Their parts are generally considered a reliable, budget-friendly alternative to OEM. For a simple part like a wiper arm, they offer a good balance of price and predictable quality. Some user reviews note minor issues like paint finish, but they are functionally sound. |
| Economy / Generic | Replacement | This category includes house brands or unbranded parts. They are typically the most affordable option. For a straightforward mechanical part like a wiper arm, these can be a perfectly acceptable choice, though quality can be less consistent than with a known brand. |
Pro Tip: Replacing wiper arms is a great time to also install new wiper blades. A new arm can't do its job properly with a worn-out blade. Also, consider applying a small amount of anti-seize compound to the splines of the wiper pivot before installing the new arm to make future removal easier.
Frequently Asked Questions (FAQ)
Is it hard to replace a wiper arm on a 1985-1993 C3500?
No, it is a very easy job that most owners can do themselves in a few minutes with no special tools. You simply lift the arm off the glass, use a small screwdriver or your finger to pull out a small locking tab at the base, and wiggle the arm off the splined post. Installation is the reverse of removal.
My wipers stopped working. Is it the arm?
Probably not. If they stopped moving completely or work on and off, the most common failure point on these trucks is the wiper motor's internal circuit board (pulse board). Wiggling the electrical connector at the wiper motor can sometimes make them temporarily work, which confirms the board is the issue. A bad arm causes poor wipe quality, not a total failure to move.
Can I just bend my old wiper arm to add more pressure?
While some people attempt this as a temporary fix, it is not recommended. Bending the arm can lead to metal fatigue and breakage. It also rarely provides the even, consistent pressure of a new spring, leading to continued poor performance. Given the low cost of a new aftermarket arm, replacement is the better option.
Do I need a left and a right wiper arm?
For the 1985-1993 GMC C3500, the left (driver) and right (passenger) side wiper arms are typically the same part and are interchangeable. They are sold individually, but it's good practice to replace them in pairs to ensure even pressure and appearance.
Technical Specifications
OEM Part Numbers: 15522766 22111206
Material: Steel, Finish: Black, Length: Approx. 16 inches, Mount: Fits 5/8" diameter splined shaft, End Style: Side Lock.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- GMC C3500: