Headlight Pod Issue
Headlight Pod Issue
Author
Discussion

kestor

Original Poster:

39 posts

106 months

Wednesday 21st June 2017
quotequote all
Left sided pod comes back up some when I shut the lights off
Is this fixable by adjusting the linkage arm or is it internal/electrical
This is a new/replaced motor
If I manually put the left one all the way down (turn it up --> down flush) it creeps up as soon as the battery is reconnected
Thanks!

pk500

1,975 posts

228 months

Wednesday 21st June 2017
quotequote all
Got to be set up wrong there an up and down stop position in the motor check there doing what they should be

Penelope Stopit

11,209 posts

125 months

Wednesday 21st June 2017
quotequote all
Adjusting the mechanism will fix this problem, if you do adjust it ok for the down position and then find that the up position is out of adjustment there is very likely a problem with the position contacts within the motor gear housing

v8s4me

7,266 posts

235 months

Wednesday 21st June 2017
quotequote all
Have a look at this LINK. It might help.

RCK974X

2,521 posts

165 months

Wednesday 21st June 2017
quotequote all
From what you describe, this could actually be an electrical problem ! (yes - really)

What a lot of people don't realise is that a wiper type motor doesn't just stop dead when power is removed, unless you SHORT it.
( i.e. connect the power wires together). This will make the motor freeze pretty much instantly.

So the relay which powers the pod motor is actually a 5 pin one (= a two way switch) and it connects the 'live' wire on the motor
to either the +12 volts when on or to 0 volts (=earth and other wire) when off.

So if the wiring has been fiddled with, this might be the cause. It will only lift slightly with this problem, and it's more likely the adjuster or
motor not fitted quite right, but just adding this in case ...

[ This is also why the windscreen wiper switch is more complex than you would think, as the self park setup ALSO shorts the motor so it stops
right at the bottom of the screen ]

Hope that's useful -

Penelope Stopit

11,209 posts

125 months

Wednesday 21st June 2017
quotequote all
RCK974X said:
From what you describe, this could actually be an electrical problem ! (yes - really)

What a lot of people don't realise is that a wiper type motor doesn't just stop dead when power is removed, unless you SHORT it.
( i.e. connect the power wires together). This will make the motor freeze pretty much instantly.

So the relay which powers the pod motor is actually a 5 pin one (= a two way switch) and it connects the 'live' wire on the motor
to either the +12 volts when on or to 0 volts (=earth and other wire) when off.

So if the wiring has been fiddled with, this might be the cause. It will only lift slightly with this problem, and it's more likely the adjuster or
motor not fitted quite right, but just adding this in case ...

[ This is also why the windscreen wiper switch is more complex than you would think, as the self park setup ALSO shorts the motor so it stops
right at the bottom of the screen ]

Hope that's useful -
This is very good information, I totaly overlooked the electric breaking of the motor
Should the electric breaking not be working I would expect the motor to also ride past the fully elevated position
Below is a link to the diagrams, I notice these digarams don't show an earth at the relays for motor braking

http://www.wedgeneering.co.uk/TVR%20390SE%20p6.htm



RCK974X

2,521 posts

165 months

Wednesday 21st June 2017
quotequote all
Penelope Stopit said:
Below is a link to the diagrams, I notice these diagrams don't show an earth at the relays for motor braking

http://www.wedgeneering.co.uk/TVR%20390SE%20p6.htm
No, and it should.......those two unconnected poles go to earth on mine....(well, equivalent that is, as it's an older 2.8)

Yes, agree. If the problem only happens at the bottom then it's probably not this, and a mechanical/alignment problem.

But I have sympathy for owners who tear their hair out for an issue which is so damn simple -
but AFTER someone points it out and everyone screams "Oh SH*T!!! I should have though of that "
Been there too many times.....

Edited by RCK974X on Wednesday 21st June 23:58

kestor

Original Poster:

39 posts

106 months

Thursday 22nd June 2017
quotequote all
i"ll keep adjusting the linkage and see what happens
I still have the old top from the frozen one to compare if it comes to that
Thanks again!!

kestor

Original Poster:

39 posts

106 months

Thursday 22nd June 2017
quotequote all
Shortened up the linkage so it sits right when down
Unfortunately when up it's low
Must be internal circuit...
I'll pull apart the old one and compare, but if anyone has pictures of the insides of a correct one I'd appreciate it!

Penelope Stopit

11,209 posts

125 months

Friday 23rd June 2017
quotequote all
RCK974X said:
From what you describe, this could actually be an electrical problem ! (yes - really)

What a lot of people don't realise is that a wiper type motor doesn't just stop dead when power is removed, unless you SHORT it.
( i.e. connect the power wires together). This will make the motor freeze pretty much instantly.

So the relay which powers the pod motor is actually a 5 pin one (= a two way switch) and it connects the 'live' wire on the motor
to either the +12 volts when on or to 0 volts (=earth and other wire) when off.

So if the wiring has been fiddled with, this might be the cause. It will only lift slightly with this problem, and it's more likely the adjuster or
motor not fitted quite right, but just adding this in case ...

[ This is also why the windscreen wiper switch is more complex than you would think, as the self park setup ALSO shorts the motor so it stops
right at the bottom of the screen ]

Hope that's useful -

This first

kestor

Original Poster:

39 posts

106 months

Saturday 24th June 2017
quotequote all
Is this the same wiring? (for a TR7)

RCK974X

2,521 posts

165 months

Saturday 24th June 2017
quotequote all
Yes, mostly.

Except that the 'dash switch' is a relay on the wedge, and is connected to dip beam, and has a diode from main beam.

This allowed TVR to use anybody's light switches.....

Edited by RCK974X on Saturday 24th June 21:14