Seadoo xp di

[Brbr 4378]

Hi I have a seadoo xp Di 2003 model
I am in the middle of setting up my throttle body sensors
As I was doing the setting up I discovered when I pull the earth wire off from the sensor my negative volts go up when I have the earth wide connected volts go down I have this on the mag side and PTO side. Just wondering anyone out there have they had this problem before? If so how did they fix it? Or where can I look?

 

[etemplet]

It would help if you state where your measurement probes are connected. Check your ground wire resistance to the engine. You may have a bad connection or a damaged wire.