What would cause a pulsating electrical system on RD28ETi?
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Personally i think the alternator is probably too small for all the heating stuff your running. Those accessories pull the battery down fast then doesnt have a chance to charge it properly once your finished with them.
Im only saying this because i had a mitsubishi delica with seat warmers, front and rear window de icers, side mirror heaters and a couple of other cold weather bits as they are an import from Japan so set up for their cold weather. I replaced the alternator with one off a starwagon (same thing but not 4x4) but the stock one wasnt big enough and i had to order another. Had a similar deal with whats happening to you