Signal Flash Speed

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Signal Flash Speed

Postby Chevette Girl » 07 Jan 2006, 07:41

Anyone else ever notice something I've had with all my Chevettes: the speed at which the signal flashes drops when I turn on the headlights, and when the headlights are on, the speed at which it flashes depends on the engine speed...
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Postby Harry Flatters » 07 Jan 2006, 11:12

Sounds as though the alternator might be a bit iffy....
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Postby Herbie_Flowers » 07 Jan 2006, 14:12

dodgy earths could be at fault as well.
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Postby Chevette Girl » 21 Jan 2006, 22:18

This has been a constant with all the Chevettes I've ever had, and I've swapped alternators on all of them so often I think I could dl it with my eyes closed...
Dunno about the ground (earth), one of my Chevettes that did this had its wiring harness replaced and it didn't change anything...
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Postby jifop » 10 Apr 2006, 15:30

all my chevettes did this!
Before you say anything..... no i cant spell or type!

The post above is my own personal opinion, it is not meant to upset or cause offence, if it does bugger off.

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Postby chris(not) » 12 Apr 2006, 13:15

I think that's down to the thermal type flasher unit used- slight voltage changes cause a different lamp current hence different flash speed.

With classic "pass a problem off as a feature" thinking, this translates into "bulb failure indication" since the unit flashes at a very different speed at only half current!

Actually ISTR that modern electronic flashers have similar properties designed in.....

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Postby Doive » 12 Apr 2006, 13:22

Anyone seen a new Jag X-type indicating? Or a new Clio? I keep thinking they are broken, these huge companies have spent millions designing flasher units to emulate the flashing sequence of an Austin Allegro, circa 1973.
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Postby Herbie_Flowers » 13 Apr 2006, 00:55

really!! i must admit that when turning right at traffic lights i look down the line of cars and wait for that moment when everyones indicators are in synch for like 1 or 2 flashes. a bit sad i know but then what else do you look at when there's no totty around :lol:
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Postby Doive » 13 Apr 2006, 08:46

And I thought I was the only one :shock: :lol:

Yeah, have a look at some of the new expensive cars, the indicators appear not to work correctly.
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Postby chris(not) » 13 Apr 2006, 12:55

BTDT :)

Ever tried an old Landie with independent wipers? You can really get involved in watching them!

I find the new LED indicators (and brake lights) odd to look at- there's no slow rise and fall to the light- it's absolutely there or not there which disturbs me for some reason.

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Postby jbowman » 12 Aug 2006, 21:34

I've found the same problem, I was thinking it would be a problem for the MoT test, the indicator light stays on for at least 1 & 1/2 seconds (a long time) before each 'off blink' Ive tried other two pin relays but none of them work.
Will this be an MoT failure? :(
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Postby Doive » 14 Aug 2006, 08:26

Is this with or without the engine running? Without the engine running on mine, the flasher unit is very very slow, but when driving it's fine. Any longer than I believe 1.5 seconds between flashes is an MoT failure, but things like Allegros still pass every year. I wouldn't worry too much.
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Postby UpNorth » 14 Aug 2006, 15:58

Mine does exactly the same - about a second between on/off. If the headlights are on at tickover the flashers almost stuck on. I suspected it's caused by old relays - perhaps it's just a feature after all.
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Postby Doive » 14 Aug 2006, 16:33

More than likely. Does your alternator belt squeak at all under load? When I tightened mine up the flashers worked at normal speed.
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Postby UpNorth » 14 Aug 2006, 16:59

Doive wrote:More than likely. Does your alternator belt squeak at all under load? When I tightened mine up the flashers worked at normal speed.


No, not at all.
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Postby Doive » 14 Aug 2006, 17:04

Bang goes that theory then :lol:
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Postby Tortron » 16 Aug 2006, 00:42

adjust the contact in the flasher unit and it wont alter as much (it go slighty faster tho)
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Postby UpNorth » 16 Aug 2006, 10:21

I'll have a look & see if it's an obvious job. Funny thing is the Hazard lights flash at normal speed - must be a different relay?
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Postby Doive » 16 Aug 2006, 10:24

I think it is. I've got two flasher units under my steering column - one electronic lucas unit for the hazards, and a massive great cylindrical lucas mechanical unit off a 60s truck or something, that makes a lovely clicking noise as it engages for the indicators.
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Postby jbowman » 16 Aug 2006, 11:36

Doive, the indicator speed is the same whether the engine is on or off, but like you said if its over 1.5 seconds its a failure, Im sure mine are no longer than a second, even thats a long time :lol:

But the hazards blink normally as you guys have noticed, hmmm. :?

Has anyone come across a modern alternative to the old 2 pin relay for quicker bliking?
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Postby Doive » 16 Aug 2006, 11:49

Have a look at your earths on the flasher circuit, I cleaned all mine up ages ago and noticed a distinct difference in flasher rate. As for alternatives, I'm sure flasher units from just about any source could be modified to fit with some careful wiring. More modern electronic units rather than the old solid state electronic units could prove much better replacements. Failing that, build yourself a astable timer circuit using something like an HEF4047 and have a 10k trimmer on it to adjust your own flash rate.
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Postby jbowman » 16 Aug 2006, 14:09

Hmmm very good thinking, what I'll do is to pop down me local MoT testers and ask them if they will fail me or not, and go from there.
cheers bud! :D
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Postby UpNorth » 16 Aug 2006, 14:09

Doive wrote:a astable timer circuit using something like an HEF4047 and have a 10k trimmer on it to adjust your own flash rate.


Now why didn't I think of that!! :shock: :shock:
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Postby Tortron » 17 Aug 2006, 01:04

well the flashers would get used more than the hazzards. so the "points" get more worn and pitted etc, was like that on my suzuki fa50 (woot cheap moped for me)

just a bit of a sand and adjustment and alls fixed. you can adjust the bimetallic strip while the units operating
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Postby Herbie_Flowers » 20 Sep 2006, 22:59

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i noticed on the way to Avon Park on Sunday Ralph that your indicator speed was considerably slower than Marks, any particular reason?
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