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Not being a tech I can't answer the color coding question but I do recall the service receipt from the dealer listed two line items when they did my upgrade last week. One line item listed "wiring harness" the other listed "fuse". You can call the dealer and request they fax you a copy of the warranty repair record on your ML to review the line items of past repairs (a good reference to have for your file in any case). I'm waiting to find out if you get a response to the color coding question as I'm curious now.
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Slowdriver
2000 ML320 (37K Mi)
1985 BMW 735i (155K Mi)
1989 Caravan (102K Mi) cargo hauler
2000 Montana (40K Mi) family hauler
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