gauges go up when lights switched on

[chrisdurham]

hi guys,

noticed an odd thing, when i switch my lights on - or any large electrical load, the gauges rise up a bit - the engine temp and oil pressure ones.

anyone got an idea where to start?

[Simon says]

Check the earths on the transmission tunnel body bolt just remember to use sunglasses before you look at the picture though both my fuel and temp gauges done the same as yours and made even worse by switching on any load even the Radio some years back, never reoccurred since

Edited by Simon says on Sunday 22 April 22:04

[Alexdaredevilz]

Simon- Please don't tell me your trimmed your car with your dad's PJ's?

[OleVix]

Alexdaredevilz said:

Simon- Please don't tell me your trimmed your car with your dad's PJ's?

Yea what is that!? Looks like the waiting signal on my old TV

[jim.2007]

Looks like it was uphlostered in the ""Battenburgh" factory!

[Simon says]

Alexdaredevilz said:

Simon- Please don't tell me your trimmed your car with your dad's PJ's?

Im upset now I just knew that would get tounges wagging, you lot are so predictable

[chrisdurham]

hey,

so all the instruments earth on one of those body mount points?

Cheers

chris

[Barreti]

The earth under the centre tunnel is on the passenger side on my 92 Griff.

[Simon says]

Barreti said:

The earth under the centre tunnel is on the passenger side on my 92 Griff.

Just checked same here Ian, that was the one that gave me erratic gauge readings that bolt was finger tight not sure why as the body as never been lifted TVR quality control eh Heh Alex! when do you want your re-trim then?

[taylormj4]

Agree, sounds very much like poor earthing. As you increase current draw, the volt drop over a bad joint will increase and upset your gauges.

[chrisdurham]

hi guys, thanks,

so whats the easiest way to get into the earth point, had a look last night and the carpet seems well stuck and fixed down?

[debaron]

I had exactly this.

All the above plus clean the headlight earthing points too.

Ryan

[Simon says]

chrisdurham said:

hi guys, thanks,

so whats the easiest way to get into the earth point, had a look last night and the carpet seems well stuck and fixed down?

Chris you will have to have a poke around, it's hiding under the carpet facing towards the ground.