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I've been having problems recently where the car doesn't want to start cleanly without a jump start. It is symptomatic of a bad earth. So today I disconnected the main earth cable to clean the points of contact with the engine / chassis.

At some stage, I accidentally touched the earth cable to the chassis and got sparks. Checked with the multimeter, and I have 12V differential between the strut nut and battery -ve. There is no voltage between +ve battery and chassis. So somehow the chassis is "live".

Any suggestions as to where to even start looking. Could it be something in the alarm, because I noticed when touching the cable to chassis that the door locks appeared to be switching.

Any help greatly appreciated.

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https://www.sau.com.au/forums/topic/424329-weird-electrics/
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