ok, i just finished my big three on my 98 malibu.
i hop in the car and take it for a spin, than i notice the transmission is shifting hard. i pull in to get gas. than i remembered that i forgot to connect the sensor on the airfilter intake (removed for access). plug it in, drive some more, same sh$t. i pull in the garage frustrated as hell and remove the big three. take it out again and i noticed it was shifting better but still kinda hard. i drove for 1-2k varing the speeds start and stop than now its back to normal. wtf? :confused:

the only thing i can think of is i ran the power wire from the alt to the top post of the battery (optima yellow top dual posts). i left the stock connection on the side. maybe having voltage from different areas (top and side) screwed around with a sensor or something. this is really strange. any ideas? this is the list of gear i used.
1/0 ga welding wire
anl fuse holder 300 amp fuse
platimum battery posts.

should i have ran the new lead together with the stock connection? any help greatly apprieciated.

I would leave the stock wiring in place, just add the larger wire.

i thought thats what i did?

This statement leads me to believe you did not.

ok i got ya, but why should it make a difference?

I know in my daily driver car I have 2 different stock grounds coming from the battery.

1 makes everything work except the motor or some shiznit and the other does other stuff.

Just add to it.

X

you did put a fuse inline between your alt and your battery?

and not pluging that sensor could cause a bit of mayham and that could of been it the whole time.

i have an 300 amp fuse inline. that sensor might have been the issue but i couldn`t see that causing the tranny to shift hard. another thing is that i had the battery disconnected for over a day, and maybe the computer reset itself in combo with the sensor might have been the culprit. i`ll hook it back up this weekend and see what happens. this time i`m gonna connect the wire with the stock one on the same post.

Does the factory have a fuse between the alternator and the battery? Never seen it on a GM car so I wonder why you added one to your upgrade? Also, 300amp? Where did that value come from? You factory alternator is going to be 110amps tops. And where exactly did you put that fuse? When the car is running, both sides of that cable have potential on them so,really, if you are trying to protect that wire then there should be a fuse at each end of it...

I would suspect having your battery disconnected for that long probably reset any learning your transmission had done and, as you found, driving it for a while returns things to how they were.

yeah, i kinda figured that, guess i went into a bit of panic. i based this install from various information i have compiled over the last little while. i fused the line at 300 amps from a ga chart off the net (can`t remember the site). its hard to determain exactly what to do because everybody`s opinion varies. some say to fuse each end of the line, some say to fuse the battery end, some say not to fuse at all. its quite perplexing and a little frustrating at times. but i apprieciate your reply.