What is causing thi,

 

s passenger battery was unhooked till shop hooked it back up now it’s doing this causing check engine and gen light to come on and tach and speedo to freak out

 

Edited April 8, 20187 yr by Me78569

Can codes are stored?

OBDII codes can be stored for an infinite amount of time. Double check the battery terminals for clean and tight connections. Sounds like a poor connection or poor ground. 

It seems to be on the driver side in that wire group running by the injection pump

You might want to check that out and see if the harness is damaged or rubbing through. I know the fuel solenoid has it own fusible link but I've seen wire damage from things getting hot just before it burns through. Look closely for melted areas possibly.

I will all happened after I got my headgasket done

Is there a ads relay on a 97 12valve shop said its causing the lights to come on and off