Resistor in the Fuse Panel? V8S or Chimaera?
Discussion
Just got in from the garage having a poke around, as you do. Apart from the loom area looking like a 12 year old, no a 2 year old, has been playing with spaghetti 
I seem to have a 500 ohm resistor sited on the left hand row 5 up from the bottom 
The question is what is this for?
My fuse panel is 4 fuses wide by 6 fuses high. The S 'bible' shows the S3/4/V8S as being 4 wide by 5 high so the slot being occupied would, if fitted iaw the V8S fuse panel, be where a 30A headlamp washer one would be and I don't have that fitted. However I have an extra row of fuses at the top which is fully populated bar the left hand one.
It does beg the question if being a Chimaera spec V8S does it also share the same fuse panel?
I'd be grateful if a non Chim V8S can confirm what fuse panel you have fitted ,JSG? and a Chim V8S, Peter H before the mods (surely the fuse panel is still standard
). In addition I'd be grateful if any Chim owners that venture into the S threads could check what is the standard fuse panel size in the Chim and whether this slot is populated.
Before you ask yes I've removed the resistor and nothing seems different?? perhaps it’s an old alarm type thing no longer used? I just don't know, any ideas gratefully received.
Thanx in advance.
Harry
I seem to have a 500 ohm resistor sited on the left hand row 5 up from the bottom The question is what is this for?
My fuse panel is 4 fuses wide by 6 fuses high. The S 'bible' shows the S3/4/V8S as being 4 wide by 5 high
so the slot being occupied would, if fitted iaw the V8S fuse panel, be where a 30A headlamp washer one would be and I don't have that fitted. However I have an extra row of fuses at the top which is fully populated bar the left hand one. It does beg the question if being a Chimaera spec V8S does it also share the same fuse panel?
I'd be grateful if a non Chim V8S can confirm what fuse panel you have fitted ,JSG? and a Chim V8S, Peter H before the mods (surely the fuse panel is still standard
). In addition I'd be grateful if any Chim owners that venture into the S threads could check what is the standard fuse panel size in the Chim and whether this slot is populated. Before you ask yes I've removed the resistor and nothing seems different?? perhaps it’s an old alarm type thing no longer used? I just don't know, any ideas gratefully received.
Thanx in advance.
Harry
HarryW welcome to the mystical land of fuse panels.
I am guessing but the resistor may be something to do with wither the ECU (tune resistor etc) but why it is not in the loom where it normally resides I don't know or it is actually a diode and is to due with the headlamp flashing mechanism circuits.
AS for fuse panel variation, just discovered my 11th different one for the Griffs and Chimaeras...
Steve
I am guessing but the resistor may be something to do with wither the ECU (tune resistor etc) but why it is not in the loom where it normally resides I don't know or it is actually a diode and is to due with the headlamp flashing mechanism circuits.
AS for fuse panel variation, just discovered my 11th different one for the Griffs and Chimaeras...
Steve
Steve
Definitely not the tune resistor, I have sighted that separately in the loom as a 3K9 one. It's definitely a 500-Ohm resistor (1/4W) and not a diode. I think my guess that it was something to do with a previous alarm system, i.e. part of the voltage sensing circuit maybe? is the best guess so far.
Put it this way the car starts ok without it, but I haven't driven it to see if it affects anything else yet, curiosity more than anything at this stage. I would still be interested in what JSG and Peter have fitted though.
Harry
Definitely not the tune resistor, I have sighted that separately in the loom as a 3K9 one. It's definitely a 500-Ohm resistor (1/4W) and not a diode. I think my guess that it was something to do with a previous alarm system, i.e. part of the voltage sensing circuit maybe? is the best guess so far.
Put it this way the car starts ok without it, but I haven't driven it to see if it affects anything else yet, curiosity more than anything at this stage. I would still be interested in what JSG and Peter have fitted though.
Harry
Harry,
Sorry for the delay, been a bit busy. Mine is 4 fuses wide by 5 high as shown in the handbook and Steve's bible, although I don't have the headlamp power wash fuse or relay.
Pics for clarity? (can I say that in regard to TVR wiring?) below.
First - Fixing of fuse panel to bottom of bulkhead.
Next - Slightly clearer view of layout.
Last - ECU and snake, much tidier than the S3C was but still a pig to hold up under the carpet.
Cheers,
JSG.
Sorry for the delay, been a bit busy. Mine is 4 fuses wide by 5 high as shown in the handbook and Steve's bible, although I don't have the headlamp power wash fuse or relay.
Pics for clarity? (can I say that in regard to TVR wiring?) below.
First - Fixing of fuse panel to bottom of bulkhead.
Next - Slightly clearer view of layout.
Last - ECU and snake, much tidier than the S3C was but still a pig to hold up under the carpet.
Cheers,
JSG.
Cheers for the info and pics JSG, btw under the dash on yours looks perfect to me! if only mine was as tidy I'd be even happier.
Took it for the run to Goodwood yesterday to see the 'beast' in action with the resistor out of the panel! couldn't see any difference, still loud and fast
and all the electric ancillary bits worked when required
Harry
Took it for the run to Goodwood yesterday to see the 'beast' in action with the resistor out of the panel! couldn't see any difference, still loud and fast
and all the electric ancillary bits worked when required Harry
Harry,
The resistor may be from an old alarm or something as you thought. Have you tried contacting the previous owner?
I think the electrics being so tidy on mine is down to no one fiddling in the past - my S3 was much messier with evidence of joints for the alarm and the loom being unwrapped - more the norm I guess, but the V8S had only done around 22k miles when I got it.
Cheers,
JSG.
The resistor may be from an old alarm or something as you thought. Have you tried contacting the previous owner?
I think the electrics being so tidy on mine is down to no one fiddling in the past - my S3 was much messier with evidence of joints for the alarm and the loom being unwrapped - more the norm I guess, but the V8S had only done around 22k miles when I got it.
Cheers,
JSG.
Been researching this since the last post . I removed the resistor to see what difference it made, well I know it's all subjective but I'm sure that it didn't seem as crisp at picking up and I certainly had some cut outs when pulling up at junctions (yes the stepper motor is cleaned regularly).
I have found an interesting post on the old TVRCC mailing list (Peter Beech's site?), it states that there is a 510 ohm resistor sited near the fuse panel that lets the ECU know it's a manual box and not an auto mine whilst stating previously it was 500 Ohm actually measure 508 Ohm (close enough given tolerances). I've put it back again now and will see if I can tell the difference and or if it really does pick up a bit quicker.
Anyone got any idea what it actually does to the ECU if it is the auto/manual selector, so to speak?
Harry
PS as previously stated I know it's not the 3.9K one I sighted that.
. I removed the resistor to see what difference it made, well I know it's all subjective but I'm sure that it didn't seem as crisp at picking up and I certainly had some cut outs when pulling up at junctions (yes the stepper motor is cleaned regularly). I have found an interesting post on the old TVRCC mailing list (Peter Beech's site?), it states that there is a 510 ohm resistor sited near the fuse panel that lets the ECU know it's a manual box and not an auto
mine whilst stating previously it was 500 Ohm actually measure 508 Ohm (close enough given tolerances). I've put it back again now and will see if I can tell the difference and or if it really does pick up a bit quicker. Anyone got any idea what it actually does to the ECU if it is the auto/manual selector, so to speak?
Harry
PS as previously stated I know it's not the 3.9K one I sighted that.
OK a little more detail, more for Steve H's next update to the various bibles wiring pages than anything else.
On page 311 of the 2nd edition of the S bible, about half way up on the right hand side, the wiring diagram (for the Griff 4x) shows a 510 Ohm (R1) resistor going to the ECU but no pin out number. Well, after testing I can tell you that it goes to pin 34 of the ECU. The other side of the resistor is earthed, effectively clamping that particular circuit of the ECU to 510 Ohm. Which acording to my searching lets the ECU know it's a Manual gearbox, I assume that open cct, i.e. infinity must therefore be for a Auto gearbox!
From some comments by mark Adams in the archive posting lists (circa 97) this can, if missing or broken (as was the case with Jack Acres 400SE), cause low and erratic tick over! Possibily giving similar symptons to a fcuk stepper motor.
I wonder if there are any others out there with a problem such as this?
Harry
>> Edited by HarryW on Monday 8th July 21:18
On page 311 of the 2nd edition of the S bible, about half way up on the right hand side, the wiring diagram (for the Griff 4x) shows a 510 Ohm (R1) resistor going to the ECU but no pin out number. Well, after testing I can tell you that it goes to pin 34 of the ECU
. The other side of the resistor is earthed, effectively clamping that particular circuit of the ECU to 510 Ohm. Which acording to my searching lets the ECU know it's a Manual gearbox, I assume that open cct, i.e. infinity must therefore be for a Auto gearbox! From some comments by mark Adams in the archive posting lists (circa 97) this can, if missing or broken (as was the case with Jack Acres 400SE), cause low and erratic tick over! Possibily giving similar symptons to a fcuk stepper motor.
I wonder if there are any others out there with a problem such as this?
Harry
>> Edited by HarryW on Monday 8th July 21:18
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