Hey I am having trouble getting earth off my vls body. I am installing a relay to run 12v to the fuel pumps from the battery. And I have the relay installed in the boot. Anyway the earth off the relay & the earth from the pumps negative is all going to the same spot, but will only work if I remove off body and earth through my battery charger.. I also cannot get the multimeter to get a reading unless I put it on an external bit of metal & not affixed to my car body.
What is causing this ? Earth wires are all attached to battery & main wire is fixed to block and in good condition.
Could this be a reason for battery drain also, Please help !
You've answered your own question.....it's a bad earth.
You have an earth to the block, what about an earth from the battery to the body or the block to the body?
Im not sure it has anything besides battery negative to engine block, Should I use both battery to chassis and block to chassis or would just the block to an engine mount be the go,
Do you think when my turbo timers running and about halfway through 60 second timer it it gets a massive voltage drop & almost stalls the car ?
Either way would anyone have a solution to that problem
Obviously the block is isolated from the body via the rubber engine mounts, so providing you bridge the engine mounts it doesn't matter how you do it. I can't remember how the factory loom is set up.
Cheers for the info, monstas4 I put a strap from the block to the brake booster bracket & (sorry I dont no how to read a multimeter) but I think It means my reading went from 24.5mv to 28.5mv (this is on the 200v setting) so it was worthwile
Not sure what you're measuring there, but i'm afraid it doesn't mean much.
The best way to test an earth:
- Disconnect the +ve batt terminal
- Get a trailing lead long enough to reach the full length of the car. A trailing lead is just some reasonably heavy wire (e.g. 2.5mm^2)
- Measure the resistance of the trailing lead (should be less than 1 ohm)
- Attach one end of the trailing lead to the -ve batt terminal. Use an eyelet terminal if possible or vice grips will do.
- With the multimeter on ohms, connect 1 lead to the free end of the trailing lead and the other to the point where you want to check the earth. e.g. a point of bare metal in the boot.
- Subract the resistance in the trailing lead from the measurement you just took. This is the resistance of the path from your test point back to the battery.
Ideally this value should be less than 1 ohm and anything over 2 ohms will give you trouble.
Sorry I meant after putting the earth strap on the ignition power to my fuel pump measured higher mv & I could earth off the body to use the multimeter
