My car has had starting issues for a while, and only starts recently when being jump started. Having ruled out a flat battery, I assume the other cause can be poor earthing.

I've been plumbing in a new dash and now it doesn't even turn over and makes wierd buzzing noises when you put the ignition switch on.

Another sympton is when I turn the fia switch on my indicatiors work fine and get 12v to the dash. When I turn the ignition switch on it only gets around 6v. Would this also indicate an earthing problem or something different ?

cheers
sean

 

I've done more testing and here's a better explanation of the situation.

FIA switch on
ignition switch off
indicators dash light work normally, receiving ~8 volts

when I switch the ignition switch on, then
indicator dash lights receive ~5 volts, then over a few seconds the voltage goes down to 0

 

I assume you've checked battery voltage and it's above 12.2V ish? If the car won't crank at all but then starts with jump leads on it can only be a faulty battery. I've seen several cars do just this.

 

And you have checked your battery terminals and earths to the car's body and the engine block, for tightness and cleanliness, haven't you?

Alcazar