Sierra Multimeter/DVA Tester 18-9801, Replaces Mercury Marine 91-99750A1, White

The Sierra Multimeter/DVA Tester (18-9801) is a VOA meter with a built-in direct voltage adapter, built for testing electrical and ignition systems on Mercury ignition systems. It combines standard multimeter functions with a direct voltage adapter (DVA) circuit in a single handheld unit, letting technicians and boat owners check voltage, continuity, and ignition output without carrying separate testers. The white housing is compact, measuring 0.39 x 0.39 x 0.39 inches, and the unit is battery powered for use anywhere in the shop or at the dock.

This tester is designed as a direct replacement for the Mercury Marine 91-99750A1, so it drops into the same diagnostic role as the original Mercury tool. It is a must-have for anyone servicing Mercury ignition systems, whether troubleshooting a no-spark condition, verifying charging voltage, or checking ignition module output during a tune-up.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-9801
• Color: White
• Power Source: Battery Powered
• Measurement Type: Multimeter
• Fit Type: Universal Fit
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 1.22 pounds

Fitment

• Mercury ignition systems

Replaces (OEM)

• Mercury Marine 91-99750A1

Frequently Asked Questions

What does the Sierra 18-9801 Multimeter/DVA Tester do? It tests electrical and ignition systems, combining a VOA meter with a built-in direct voltage adapter in one handheld unit.

Is the 18-9801 a direct replacement for a Mercury part? Yes, the Sierra 18-9801 replaces Mercury Marine part number 91-99750A1 and performs the same testing functions.

What is a DVA function used for on this tester? The direct voltage adapter (DVA) built into the 18-9801 lets you measure ignition system voltage output directly, which a standard multimeter alone cannot read accurately on ignition circuits.

What color is the Sierra 18-9801 tester? The 18-9801 Multimeter/DVA Tester has a white housing.

How is the 18-9801 powered? It is battery powered, so no external power source or charging is required to use it.

What are the dimensions of the 18-9801 tester? The unit measures 0.39 x 0.39 x 0.39 inches.

How much does the 18-9801 Multimeter/DVA Tester weigh? It weighs 1.22 pounds.

What ignition systems is the 18-9801 designed to test? The Sierra 18-9801 is designed for testing Mercury ignition systems.

Is the Sierra 18-9801 a universal fit tool? Yes, it is listed as a universal fit tool for testing electrical and ignition systems rather than being restricted to one engine model.

Does the 18-9801 include only the meter, or additional accessories? The 18-9801 Multimeter/DVA Tester unit itself is the included component.