Earth strap, faulty, replacement or not
Yes I know the pictures aren't great, I borrowed someone to crank the car while I photograph one handed
Do a simple voltage drop testing under load
Can be done with a test light or multimeter makes no difference in this case
Here I am going use a test light, for the last year or so it's been may main electrical diagnostic tool
Yes I have oscilloscopes, fluke meters and multiplexers, but for the majority of car faults a test light is better as it shows some current can pass through a wire rather than just voltage present
Yes this is a Suzuki not a fiat, but the principles are the same
Attach the light to the battery negative
Touch the test light on battery positive, to make sure it's got a good connection and the lamp hasn't blown
Scratch some clean metal and crank or try to
Here the earth strap bolt lights up
But if put the probe on the cable eye and crank the engine it does not light
The problem is the connection between the earth strap and the block not the earth strap itself
Often people say I've measured the ohms and it's okay, no you proved there is continuity not it's able to carry a couple of hundred Amps
Here the same Suzuki before it was fixed
If you are using a multimeter on the volts range. Ideally it should be under 200 millivolts
while canking or tying to
There's a video in post 15 of a faulty earth on a panda
