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Author Topic: Earthing strap  (Read 279 times)

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BazaJT

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Earthing strap
« on: 28 July 2019, 19:40:25 »

Does the f/l V6 have an earthing strap between the engine and body[thinking particularly in the radiator front of engine area]?Haynes mentions one thereabouts for the early cars but goes on to state where applicable.Just wondering if something like that could affect the rev counter/speedo.A new rad was fitted  awhile ago and straight afterwards the rev counter/speedo began acting up with most of the time they didn't work[while the rest of cluster did]this seemed to be cured when I fitted a new battery not long ago.Now since having all the gubbins out from between rad and engine to replace auxiliary belt it's gone back to having the same rev counter/speedo problem >:( so wondered if there is indeed an earth strap there whether it's making a bad connection that I've disturbed.
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Doctor Gollum

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Re: Earthing strap
« Reply #1 on: 28 July 2019, 19:50:05 »

It does, but shouldn't have been affected by a radiator change unless you're a complete butcher :-\

It connects the block to the subframe iirc :y
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Migv6 le Frog Fan

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Re: Earthing strap
« Reply #2 on: 28 July 2019, 19:50:55 »

Yes, there is one at the bottom n/s of the engine. near the bottom of the a/c compressor, and goes to the chassis.
Easy to disturb when changing the rad, as they can corrode / rot over time and then might be easy to damage if working in the area  ;)
The one on my car was almost rotted through when I got the car.


Edit. That damn doctor can type fast.  ::) ;D
« Last Edit: 28 July 2019, 19:54:10 by Migv6 »
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Bigron

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Re: Earthing strap
« Reply #3 on: 28 July 2019, 19:52:22 »

If you can't see an earth strap, why not fit one as a cheap way to eliminate that as a possible cause of your problem?

Ron.
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BazaJT

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Re: Earthing strap
« Reply #4 on: 28 July 2019, 20:08:01 »

It was as Migv6 suggests the idea of corrosion/rot that had me thinking of this and obviously swapping the auxiliary belt in order to bypass the aircon compressor means I was delving into this area,although I didn't notice an earth strap it doesn't mean there isn't one as I just wasn't looking for one it's only since running it afterwards to bleed the cooling system after also fitting a new 'stat/cts/temp sender that I noticed it happening again.As Bigron says I'll buy one[for the minimal cost of one]and see about fitting that.This car has been more problematical than Terrys whole fleet of Astras ;D
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robson

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Re: Earthing strap
« Reply #5 on: 29 July 2019, 20:35:35 »

connect a jump lead just to check?
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Diamond Black Geezer

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Re: Earthing strap
« Reply #6 on: 29 July 2019, 21:09:05 »

Hey mate I found I wasn't getting quite enough charge after a long period of hunting I discovered beneath sludge the remains of an earth strap torn off. So worth doing as you say, however doesn't seem to answer your speedo issue.
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Doctor Gollum

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Re: Earthing strap
« Reply #7 on: 29 July 2019, 21:19:43 »

Low voltages does cause havoc with the electricals ;)

Run KWs excellent how to electrical diagnostic tests and report back :y
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BazaJT

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Re: Earthing strap
« Reply #8 on: 30 July 2019, 12:34:05 »

Cannot see an earth strap from above-can only see a short way back along the aircon compressor before pipework etc gets in way-and unable to get a clear view from underneath at present.Don't have[as has been suggested]any jump leads to try that.Had a look at KW's guide but can only do a few of the checks as I don't have access to help.The results were battery at rest 12.79,engine running at its start up speed[just over 1,000 revs]14.79,engine at its normal tickover[about 500revs or just under]14.45 engine at tickover-lights on and heater on lowest setting 14.39 rising to 14.7 when engine revved by hand[to I'd guess somewhere around 2,000revs.Rev counter still not working-needle fluttering at bottom of gauge until engine stopped when it jumps to registering about 100revs[this drops back to O when ignition turned back on.All 3 fans still turn on all at once when temp gauge registers 90 temp will then drop to about 88 but the fans remain running until after engine switched off.
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Re: Earthing strap
« Reply #9 on: 30 July 2019, 13:10:17 »

A piece of wire between the front lifting eye and battery negative will suffice  :y

Voltages might just be OK, seem a touch high perhaps, but it's possible that the car simply requires more use :-\
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Migv6 le Frog Fan

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Re: Earthing strap
« Reply #10 on: 30 July 2019, 14:00:31 »

Doubt you would be able to see it from above. Easy to see from underneath though, which probably isn't much help if the car is parked up on top of a big puddle or similar.
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