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Try a gear reduction starter if they make them for the 6.9/7.3L and custom battery cables in 2ga, 1ga, 0ga or 00ga.
I was going to do something like this, run a 6 and 8 volt optima (for an alt delete) and regulate down to 14.4v to all the electronic bits. Then I discovered 00ga welding cable and that my suburban had a cheap 4ga battery replacement cable installed.
Now I run LiFePO4 batteries. The larger battery runs on 2ga cable to the starter and the smaller battery runs 4ga to the starter. 2ga+4ga equals something like 00ga or 000ga.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
Last edited by oil pan 4; 08-20-2014 at 07:05 PM..
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