dual batteries

[Michael John Majchrzak]

i have a 2002 tahoe im putting in a 350 amp alt and want to put 2 batteries under the hood idk where to get the second battery tray from and do i need to put in isolators also if anyone knows if i have to put in a interface for the onstar or can i go without it?

[ToNasty]

Chevrolet dealer. The battery tray and bolt is about 50 bucks

[SnowDrifter]

Not sure about onstar

No isolators. But do make sure to fuse the positive wire connecting the two batteries in two places: Once near each battery

[Michael John Majchrzak]

ok thanks guys

[reedal]

If you want to retain onstar with an aftermarket radio, then yes you need to buy an interface to plug-n-play with the factory radio that retains the onstar.

http://www.pac-audio.com/productSearch.aspx?Make=Chevrolet&MakeId=4&Model=Tahoe&ModelId=1555&Year=2002&YearId=13&CategoryId=26

[Michael John Majchrzak]

wats the biggest battery i can fit in the aux battery tray?

[islandpride684]

wats the biggest battery i can fit in the aux battery tray?

Measure the tray and compare it the battery sizes...