Where is the pulse board on a 1998 Chevy s10 wiper motor?

The 1998 Chevy S10 wiper motor doesn't have a separate "pulse board" in the same way some more modern vehicles do. The pulse width modulation (PWM) signal that controls the intermittent wiper speed is handled internally within the wiper motor control module, which is typically integrated into the wiper motor itself or located very close to it, often within the same assembly. There's no separate, easily identifiable board to replace.

If you're having intermittent wiper issues, the problem is more likely to be within the:

* Wiper motor itself: Worn brushes, internal wiring issues, or a failing motor are common culprits.

* Wiper motor control module: This module processes the signal from the switch and controls the motor speed. A faulty module needs replacement.

* Wiring harness: Corrosion, damaged wires, or poor connections can interrupt the signal to the motor.

* Wiper switch: A problem within the switch itself could send incorrect signals.

To troubleshoot, you'd need to test the motor directly with a known good power supply (paying attention to polarity), check the wiring for continuity and damage, and potentially test the resistance of the components within the wiper motor assembly (though this requires some electrical expertise). If you're not comfortable working with car electrical systems, it's best to take it to a mechanic.