Strange problem with a 2 hard drive mac

I have a power mac 7600/132 used for os9 apps that has had 2 hard drives for the longest time. One day the second hard drive wasn't showing up but the original hd works fine. I found that if you disconnect the power cord from the original hd and leave the scsi? (the bigger plug) plugged in the second hard drive will work fine but if i disconnect the scsi plug from the original hd leaving only the second hd hooked up by itself nothing works at all. I think this is very strange but is there a fix for this i am looking to use the second hard drive only if i can get it to work alone.
to clarify this:
when both hard drives are hooked up properly: only the original hd works the second drive i can hear spinning up but does not appear on desktop.
when i disconnect power cord from original hard drive but leave its scsi cord attached and have second hard drive hooked up properly: Second hard drive works fine.
when i disconnect both cables from the original hard drive completely from the system and have second hard drive hooked up correctly: nothing works, mac wont even boot from cd.
i cant make sense of this but maybe someone else will know
thanks for any help you can give me
running os 9
Message was edited by: inzgary2200

It would be really nice if every manufacturer arranged their jumpers the same way. But alas, that is not the case. Some manufacturers have a general trend they tend to follow, others have a different arrangement for every drive they sell.
Drive Jumpers are tiny plastic cases that conceal a stamped brassy-looking shunt. This is placed over two adjacent brassy-looking pins to make a connection. The jumper used for Termination is just like the ones used for SCSI addresses. There may be one two or even three different places on the drive where these jumpers appear, and they sometimes even use different sized jumpers at the different locations.
There are two spacings for drive jumpers. Older drives and most IDE drives tend to have their pins spaced 0.1 inch apart, so a stack of 10 jumpers side-by-side would be an inch tall. Many SCSI drives use jumper pins that are 2mm spacing, so a stack of 12+1/2 would be an inch tall. It seems like not a lot of difference, but the moment you have to install two side-by-side, you realize that sometimes you need exactly the right size.
If you can post the make & model of the drive, (and the capacity if you have it) someone will either have a printout of the strapping guide or be able to find one online.

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