PAI MSW-1238 Relay Switch 4-Terminal – Mack / International 39MT Caterpillar 3406E (later production with

Caterpillar 3406E (later production with this sensor variant)

fan clutches

Watson & Chalin: AS-01471G

Donaldson: P573482

Ram 2500/3500/4500/5500 (6

PAI MSW-1238 Relay Switch 4-Terminal – Mack / International 39MT Caterpillar 3406E (later production withThe PAI MSW 1238 is a 12V, 4 terminal intermittent duty relay switch (starter heavy load relay) that replaces Mack 2MR358A 85129178 and Navistar 1825898C94 across Mack heavy trucks and International medium and heavy duty trucks. Rated 100 A continuous 750 A surge, SPST, external ground; mounting and terminal hardware included for direct fit at the OE relay bracket location on the firewall or starter circuit junction. Signs You Need a New Relay Switch