Discussion
Hi Chaps,
Just taken trev out for a blast and I seem to have no temp, oil sensors and rev counter. The speedo just about gets to 20mph although driving faster. Fans work fine. Pulled over to make sure no loose fuses -all seem ok.
Any ideas?
I did over heat last week which vented from expansion tank if that could be linked?
Other than the car drives lovely.
I’d welcome any pointers!
Just taken trev out for a blast and I seem to have no temp, oil sensors and rev counter. The speedo just about gets to 20mph although driving faster. Fans work fine. Pulled over to make sure no loose fuses -all seem ok.
Any ideas?
I did over heat last week which vented from expansion tank if that could be linked?
Other than the car drives lovely.
I’d welcome any pointers!
Check ALL the fuses. They love a bit of extreme heat and a bit of TVR damp in the passenger footwell, NOT.
They might look fine, but they may be corroded. Same for the relays. Take it all out (one by one, obviously!) and give it all a spray with electrical contact cleaner.
It's a TVR. I've had all sorts of weird electrical gremlins. ABC - Assume nothing, Believe nothing, Check everything.
They might look fine, but they may be corroded. Same for the relays. Take it all out (one by one, obviously!) and give it all a spray with electrical contact cleaner.
It's a TVR. I've had all sorts of weird electrical gremlins. ABC - Assume nothing, Believe nothing, Check everything.
No, but any black wire is generally an earth wire. I'd say it's unlikely to be an earth (yes, yes I know they're fibreglass and renowned for bad earth points) because all if it has gone at once.
Of course, you could eliminate the bad earth possibility by rigging up a good earth and introducing it to a black wire. You can bet they're all daisy chained together.
Much more likely to be a fuse/supply issue.
Of course, you could eliminate the bad earth possibility by rigging up a good earth and introducing it to a black wire. You can bet they're all daisy chained together.
Much more likely to be a fuse/supply issue.
The gauges use fuse 16 and are earthed at the chassis fixing bolt on the offside tunnel top.
It is not easy to get at this bolt unless someone has been in there before. The tunnel top just at the bottom of the dash has a ridge along the top of the footwell side wall. this ridge is fibreglass and covered in carpet but there is a gap in the GF ridge just where the bolt head is so to get at the bolt you will have to make a cut in the carpet (which someone before you may have done). If you cannot find an existing slit in the carpet then you will need start at a point just below the bottom of the dash face an start pressing against the carpet towards the top of the ridge. Work you way forward until you can feel the gap in the GF (about 2" wide) behind the carpet. Next find how low that gap extends and slit the carpet. You can then poke your finger in and find the bolt head. Use a 17mm spanner to tighten the bolt. You do not want to think about cleaning the earth terminals as just getting at the bolt head is bad enough.
Below is a picture of the tunnel top with the gap circled in red. You can gauge from the front face of the radio housing how far forwards the gap is.
Steve
It is not easy to get at this bolt unless someone has been in there before. The tunnel top just at the bottom of the dash has a ridge along the top of the footwell side wall. this ridge is fibreglass and covered in carpet but there is a gap in the GF ridge just where the bolt head is so to get at the bolt you will have to make a cut in the carpet (which someone before you may have done). If you cannot find an existing slit in the carpet then you will need start at a point just below the bottom of the dash face an start pressing against the carpet towards the top of the ridge. Work you way forward until you can feel the gap in the GF (about 2" wide) behind the carpet. Next find how low that gap extends and slit the carpet. You can then poke your finger in and find the bolt head. Use a 17mm spanner to tighten the bolt. You do not want to think about cleaning the earth terminals as just getting at the bolt head is bad enough.
Below is a picture of the tunnel top with the gap circled in red. You can gauge from the front face of the radio housing how far forwards the gap is.
Steve
Tyre Smoke said:
Jesus wept Steve! 
I think I might consider earthing somewhere more accessible.
There will be 3 or 4 ring terminals on that bolt and the same on the bolt at the other side of the tunnel. I think I might consider earthing somewhere more accessible. When we take a body off we never remove the bolt just unscrew it and leave it in the body with the ring terminals on it. if you take it out you risk one or more rings going walkies which will be the start of a bad day/week trying to find it and get it back into place.
Steve
Steve_D said:
The gauges use fuse 16 and are earthed at the chassis fixing bolt on the offside tunnel top.
It is not easy to get at this bolt unless someone has been in there before. The tunnel top just at the bottom of the dash has a ridge along the top of the footwell side wall. this ridge is fibreglass and covered in carpet but there is a gap in the GF ridge just where the bolt head is so to get at the bolt you will have to make a cut in the carpet (which someone before you may have done). If you cannot find an existing slit in the carpet then you will need start at a point just below the bottom of the dash face an start pressing against the carpet towards the top of the ridge. Work you way forward until you can feel the gap in the GF (about 2" wide) behind the carpet. Next find how low that gap extends and slit the carpet. You can then poke your finger in and find the bolt head. Use a 17mm spanner to tighten the bolt. You do not want to think about cleaning the earth terminals as just getting at the bolt head is bad enough.
Below is a picture of the tunnel top with the gap circled in red. You can gauge from the front face of the radio housing how far forwards the gap is.
Steve
Thanks steve! I built the car so I know it well, I did recarpet over it so I will have a good look tomorrow and try and clean these up. I’m confident I did clean and fully secure all earthing points, but will certainly look at it. It is not easy to get at this bolt unless someone has been in there before. The tunnel top just at the bottom of the dash has a ridge along the top of the footwell side wall. this ridge is fibreglass and covered in carpet but there is a gap in the GF ridge just where the bolt head is so to get at the bolt you will have to make a cut in the carpet (which someone before you may have done). If you cannot find an existing slit in the carpet then you will need start at a point just below the bottom of the dash face an start pressing against the carpet towards the top of the ridge. Work you way forward until you can feel the gap in the GF (about 2" wide) behind the carpet. Next find how low that gap extends and slit the carpet. You can then poke your finger in and find the bolt head. Use a 17mm spanner to tighten the bolt. You do not want to think about cleaning the earth terminals as just getting at the bolt head is bad enough.
Below is a picture of the tunnel top with the gap circled in red. You can gauge from the front face of the radio housing how far forwards the gap is.
Steve
I also noticed the radio panel lights just about the “three buttons” flickering too if that adds to your theory?
thanks chaps! 
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