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Old 08-20-2012, 08:55 AM
leverhead leverhead is offline
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CS Alt/sense wire/batt in trunk w accessories

Hello all. Trying to decide about where to run alt sense wire. The battery is in the trunk and the distribution block is up front under the dash. A 4 awg cable connects the block to the battery (thru a cutoff switch). The block distributes to the fuse block and rest of car. However, an EFI ECU and MSD go direct to the battery, and possibly an air ride system later on. Possible solutions are:

To the battery (hot side of switch) -
Pros - full voltage at battery for battery, ECU, MSD and anything running off the battery.
Cons - long wire run (12 awg) & possible voltage drop at sense wire?, maybe too many volts at block up front as alt compensates at rear of car?

To the block -
Pros - Full voltage at block and everything up front
Cons - possible voltage drop at battery combined with drain on battery from ECU, MSD etc running directly off of it?

Jumper to alt 'BAT' terminal -
Pros - easy & no wire run to deal with
Cons - no alt compensation

Any experience or suggestions are appreciated. Thanks.
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