Rev counter drops to zero and clock display goes off when I switch on my headlights.....
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#1402870
(In Topic #184440)
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86 gti cabby
Anyone have any ideas where I should start looking?cf_emoticons__BangHead:regards
KP
Posted
COTM Team
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Thats a great help. I've had a look and there is a loose cable down in there - could this be the earth cable?aircooled1968 said
look on your engine, gear box side, on thr rocker cover there should be a little wire on the rear corner of the engine, its a little eart cable, if thats broken off then the dash lights rev counter etc dont work when lights are on, mate had same problem,
hope helps
Got some pics below:
Here the rear of the rocker cover and there is already a black Earth cable going to the ignition coil:
Here is the loose cable:
And here is how it is sitting in the engine. You can see the earth to the coil and the loose cable below to the left :
Where do you think that loose cable should be attached to?
regards
KP
Posted
MOTY 2013
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
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I tested the voltage on the cable before securing it and it was reading 3.3 v - will that be right? I then rested the cable on top off the rocker cover with the engine running and there was no spark so figured it was safe to then bolt it down properly. Cable wasn't long enough to stretch to coolant flange so bolted onto rocker cover along with other earth that goes to ignition coil - Instrument dash all now working a treat.
Bizarre about the 3.3 volts though
Posted
MOTY 2013
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
Posted
Local Hero
1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
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The rev counter and clock issue has been resolved. however, noticed some really odd stuff going on with dash and lights.
1 - Dash lights are really dim. And only really illuminating above rev counter.
2 - n/s and o/s indicators work as normal. - actually they maybe flash a bit too fast. But when put hazards on, only the o/s flashes.
3 - fuel gauge doesn't seem to be registering any fuel but I know there is fuel in it.
4 - also noticed a spade connector (2 connectors on it) on the gear box with nothing connected to it and on further investigation there are 2 loose cables with spade connectors lying under the coolant reservoir. Should these cables be connected to the gear box?
Regards
Posted
MOTY 2013
1. dimmer wheel set to full ya? if so bulbs may just be old/blown and dim
2. hazard switch i would say if they work normally
3. unplug level sender and bridge pins with wire, if gauge goes to full wioring is ok sender needs lookign at. if not check the wiring, the earth for the sender goes to the claw above the fusebox so look for any loose brown wires coming out of the rear wiring loom
4. black and blue/black? if so those are reverse switch wires, they run to a connector on the lighting loom with same colour wires
you will have another 2 pin plug spare with yellow/white and brown thats front fogs, plus if its a later one there will be another with yellow and yellow/black thats dimdip resistor
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
Posted
COTM Team
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1 - yeah dimmer makes very little difference - so guess bulbs have gone? How many are there? and what rating should I buy?rubjonny said
ah ok, the flange thing must be a mk2 only thign then.
1. dimmer wheel set to full ya? if so bulbs may just be old/blown and dim
2. hazard switch i would say if they work normally
3. unplug level sender and bridge pins with wire, if gauge goes to full wioring is ok sender needs lookign at. if not check the wiring, the earth for the sender goes to the claw above the fusebox so look for any loose brown wires coming out of the rear wiring loom
4. black and blue/black? if so those are reverse switch wires, they run to a connector on the lighting loom with same colour wires
you will have another 2 pin plug spare with yellow/white and brown thats front fogs, plus if its a later one there will be another with yellow and yellow/black thats dimdip resistor
2 - possible, i can check that when i replace the bulbs
3 - still to do.
4 yes black and blue/black - both with blue rubber spade covers - should these plug into that loose connector on the gear box? and are they the reverse lights?
I've also noticed other stuff on the electrics not working - electric windows barely move down and they won't move back up. brake light on dash and seat belt warning light on dash don't work. I'll add some photos of the fuse box below there are hanging loose wires and it doesn't seem to be located in the bracket properly.
Does not fit in bracket:
Red cable lying loose inside centre console:
also loose
More loose:
thanks
KP
Posted
MOTY 2013
reverse switch wires yes, they should pop onto the switch and you should be sorted. if the lights come on then switch stuck closed and this is why they were disconnected. if they dont fit the switch the box has been changed at some point you just need to change the switch for the right one
with the fusebox drop it down and jiggle it around till it hooks back in properly, if its been fiddled with before you may need to move the wiring about behind if its too tight
have to trace that red wire could be a few things or not even factory. radio or ciggy lighter perhaps
grey/white wire usually related to rear fog lights, again trace it
red crimp need to expose the wire colour to see if it can be identified
looks liek maybe had an alarm install or something along those lines. check all the brown wires around fusebox area make sure non are hanging loose. you should have a chunky brown coming in with lighting loom, there should be a wire from here to one of the claws above the fusebox plus a wire from the engine loom to here as well. make sure all the earth claws are earthed to each other and the wire from the lighting loom otherwise all the dahs earths will be bad. you might find 2 of the claws are looped to each other with a brown thats fine, so long as at least one of them is earthed to the lighting loom earth
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
Posted
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sorry to bring back an old thread but I seem to have the same issue as the OP - when I turn the light on my MFA goes bland and the rev counter drops to zero with the engine running. Turn lights off and the rev counter will work + MFA will have reset to 00:00.
I had a look for the earth on the NS corner of the rocker plate and found one attached (see centre of image).
Would this be the correct earth to check with this issue? It seems firmly attached but it's a bit gunky. Not sure, however, if gunk would prevent it from functioning as an earth?
Or if it's not that one, would it be attached elsewhere?
Not sure what my next steps should be really. Do I remove the earth, tidy it up and refit? Can I check the voltage on it to figure if it's attached to anything or come loose the other end?
I looked in the footwell of the DS briefly but frankly had no idea what I was looking it. The only thing that looked slight off was there was a very thin black wire dangling down loosely, which seemed to come roughly from the direction of the light switch, however, I couldn't even quite tell if it was a wire or just a sleeve.
New to this, so thanks for helping
Posted
Local Hero
Rev counter drops to zero and clock display goes off when I switch on my headlights.....
Sent from my iPhone using Tapatalk
1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
Posted
Settled In
Rev counter drops to zero and clock display goes off when I switch on my headlights.....
Thanks
Posted
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Rev counter drops to zero and clock display goes off when I switch on my headlights.....
I can’t see any other loose wires anywhere in the engine bay really. Unfortunately I don’t have a Haynes manual yet so I’m not sure what I’m looking at in the engine bay half the time!
Thanks
Posted
Local Hero
If I can get tapatalk to work I'll post a picture….
1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
Posted
Local Hero
Rev counter drops to zero and clock display goes off when I switch on my headlights.....
Sent from my iPhone using Tapatalk
1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
Posted
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Rev counter drops to zero and clock display goes off when I switch on my headlights.....
Def haven’t got that at the moment - could that be the reason for the rev counter issues with lights on then?
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