Please all reply I need help

[TnBlkC230WZ]

Tim,
AKA 71RS/SS396
VA talked me into trying a 140 amp 3 wire Tuff Stuff. Rick at VA said I need to run a ground from the alternator case to the block, I’m going to try that he also said I may need a larger wire from the alternator to the Junction/Starter I think I’m running an 8 gauge I’ll go to a say 4 gauge what do ya think?

Thank you to everyone that replied your thoughts and consideration are much appreciated.
Good luck on all your projects.
Keith

How long is the current charge wire? Wire size is determined by load and length. At 160 amps a four foot 8 gauge wire will have a 1 volt drop on a 12 volt system (slightly more at 14 volts). This one volt drop is within normal ranges and isn't an issue if your sense wire is there to up the voltage. With a one wire alternator, you will never get full voltage unless you are only drawing 25 or 30 amps.



I don't recommend a one wire altenator for street applications either, but if you do run one, you need to up your wire sizes one or two gauge sizes. So if your run is over 2 feet, a 4 gauge cable is needed instead of the 8 gauge needed for the three wire alternator. Under two feet and the 8 gauge should be ok with only a .5 volt drop.

Keep in mind your nominal draw is probably less than 80 amps