The Mack caution decal, part number 25157779 or 4MR21059M (catalog number 9RJ44M3), carries a printed warning specific to vehicles equipped with sensitive electronic control systems. The decal text reads: "To avoid damage to sensitive electronic equipment, disconnect ALL battery cables and disconnect harnesses to electronic control units before welding. Do NOT disconnect batteries while engine is running." This label is used on Mack transmissions and related assemblies where ECU protection during shop welding operations is a critical safety concern. Call us to confirm this is the correct decal for your specific Mack application.
Features
Genuine Mack part numbers 25157779 or 4MR21059M
Catalog number 9RJ44M3
Printed caution warning for ECU and electronic equipment protection during welding
Instructs disconnection of ALL battery cables and ECU harnesses before welding
Specifically warns against disconnecting batteries while engine is running
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