ok dropping a new motor. its freshly rebuilt.. its a b18b in a 90integra, using the b18a harness, dizzy and everything .. the only thing from the b18b is the motor and the intake manifold. i have primed the motor but the problem is that i am losing ground on the motor when i crank it ..
originally i had a fuse inline of the battery relocated in the trunk and it kept popping so i took it out .. the started wont work unless i ground the starter to the chassis with a 10 gauge wire

i put a multi meter on it ... i have the positive lead on a constand 12 volt source and the negative lead on the block .. when normal i have 12 volts but when i crank the car it drops down to about 5-7 volts.

any clue ? please?? anything ??

 

Maybe that battery cause you seem to lose it when you put load on the batt right other wise you have some sever wiring issues just double cheack all you connections and grounds maybe one came loose.

 

You can load-test the battery. Put your voltmeter across the battery terminals themselves. Not the clamps, but the actual battery posts. What's the battery voltage do when you crank the starter? If it goes down to 5-7 volts, then your battery's on it's way out.

If the battery stays up closer to 9 or so, then the problem is too much resistance in the battery wires going back to the trunk. Maybe you used too-small cables? Maybe there's corrosion at any of the connections? Use your voltmeter to check that stuff piece by piece (while cranking) until you find a big voltage drop.