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Moderators: NOT political, but important point to make here. Song Chuan is a TAIWANESE company with factories around the world. Do keep in mind the history of Taiwan as the true seat of legitimate mainland Chinese government forced out by the Chinese Communists under Chiang Kai Scheck/Mao...

Do a search for “How to repair HMMWVf EESS S3”. Retiredwarhorse posted this: ”...if you look at the old schematic of a PCB...not an EESS, it shows 6 items in the box. 1. Wait to start lamp 2. Lamp check 3. Frequency lockout/load dump 4. Glow plug control 5. Reverse polarity load dump 6...

Um, no, the S3 box has a diagnostics port in front with a cap on a chain, and yes, the temp. sensor is different. This is a picture of a Nartron Smart Start unit:

Hard to say which component went mammary glands up, troubleshooting and repair could be time-intensive but doable for someone with good circuit-tracing and repair skills. Best bet is replacing the box and temp sensor with the latest/bestest unit, often available in the $400-$500 range. Buy...