this is my first MB experience, bought the 80 300CD with new glow plugs, has a cold start issue, needs starting fluid even in the now warm weather. I like to do my own work, even major rebuilds and have experience with diesels (off road). Most likely an electrical problem here, should check +and- (wiring), relay(s), is there a most frequent issue here to look for. Appreciate any help I can get here, thanks in advance.

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80 300CD new to me