battery disconnect & efi keep alive revisited ?

[vector1]

alright, i've been doing some studying and want to bounce my plans off of someone who knows better.

my efi tune guy wants the efi power to go directly to the battery +, so somewhere inline i should put a fuse.

my alt hot wire is going either to the battery side of the disconnect or to one of the other paired terminals, this being a 4 post disconnect switch, of which i have read is supposed to cut alt. power milliseconds before battery disconnect to avoid "load dump".

i also have a keep alive wb o2 wire so i am considering running a 5 or 10 amp resettable circuit breaker between the two power posts on the disconnect to supply power.

does all this sound kosher? i think i've read 100 ways to do this stuff.

thanks for all your help

cheers

mark

[RICK LAKE]

vector1 Mark all systems are different. I think you may have some info wrong. I have not heard of a WB O2 sensor needing power all the time. This could burn out the sensor if it has a heater and would kill the battery. I have a Speed-pro system and unhook it everyyear. The programming for the software stays inside and in the spring the car starts right up after cleaning out the oiling of the motor for winter storage. Most EFI systems do want a 12 volt source for memory in there ECU's. More info would help on the system you are running Rick L.

[vector1]

thanks rick, i'll run this by the tune guy. i'm running accel dfi gen VII.

[vector1]

the keep alive wire is for memory retention of the wbo2 system and will not harm the sensors, fyi.