7586-001 QuickCable 2/0 Gauge 8" Lead Offset Jumper (Each) - QuickHarnesses are the easy and correct way to interconnect batteries in parallel or series in group 27 and 31 battery applications. Our parallel battery jumpers are 2/0 gauge and come in a variety of configurations for two or three battery setups. Our series jumpers are 1 or 2/0 gauge depending on the voltage requirements. Can’t find exactly what you are looking for? Not a problem! We offer custom made versions as well.