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how do i do an easy dual battery for cold starts on a 1982 mercedes diesel (300sd turbo)?

i was hoping that the replacement battery would be charged by the alternator by wiring as if i was being jumped... is this possible

Easiest way I can think off is to put a secons battery in the trunk with the - and + run in series to the main battery and a circuit breaker on the positive line, with the circut breaker in the truck you can engage the battery for boosting nd charging, and disengage when full and not needed, i did this with my 1986 Honda Accord.