RB25det alternator wiring - 240sxONE Forums Jan 08, 2010RB25det alternator wiring Electrical Tech. Awsome that's what I needed to know now the question is what size fuse should I use for the wire that goes to +12v ? I gess I could just measure how many amps it draws normally and size up a couple amps. rb25det into r32 wiring for dummies | Driftworks Forum May 22, 2012Whoow!! chill pill guys, the thread is only recent and people do have lives so no need to get abusive when your asking for help! You said you would post pictures but didn't so its not like you have provided people with alot of information.