Classic cars forum & vehicle restoration.
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badhuis
Joined: 20 Aug 2008
Posts: 1390
Location: Netherlands
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 Posted: Sat Dec 06, 2014 3:34 pm Post subject: almost non-flashing indicator warning light |
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1963 TR4 with standard Lucas equipment.
Flashers work OK, and I can hear the flasher unit ticking. When switching on the flasher, either LH or RH, there's just one (fairly dim) lighting up of the indicator light (on the dashboard). No more.
I exchange the flasher unit with another one and this had the same result.
Looked at the grounding of the warning light and even fitted a separate ground wire to the housing, no result.
The strange thing is that I have the same happening on my Jaguar 420. This has two warning lights - one with a LH arrow on it and one with a RH arrow. Both flash just once (dimly) when indicating, and again all indicator lamps flash just fine.
Any tips what would be the cause of this?
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DM
Joined: 21 Dec 2008
Posts: 212
Location: North Cornwall
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| Posted: Sat Dec 06, 2014 6:11 pm Post subject: |
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I'd expect that you have two faulty flasher relays.
Prove it by taking the indicator light wire off the relay and temporarilly connecting it directly to a fused 12v supply.
If the indicator light works ok then it must be the relay at fault. |
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47Jag
Joined: 26 Jun 2008
Posts: 1480
Location: Bothwell, Scotland
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| Posted: Sat Dec 06, 2014 6:21 pm Post subject: |
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Badhuis,
The standard Lucas system for two warning lights is that the warning light terminal on the flasher unit is common to both lamps then the other L/S warning light wire is connected to the R/S flasher lamp feed and vice versa. The warning light gets it's ground/earth through the opposite side flasher lamps. If you only have one warning the other wire would go to ground/earth
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Phil - Nottingham
Joined: 01 Jan 2008
Posts: 1252
Location: Nottingham
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| Posted: Sat Dec 06, 2014 10:18 pm Post subject: |
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IMHO flasher problems 99.9% are usually caused by bad earths or poor connections at the lamps
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Old Wrench
Joined: 23 Dec 2013
Posts: 226
Location: Essex and France
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| Posted: Sun Dec 07, 2014 3:46 pm Post subject: |
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| Phil - Nottingham wrote: | | IMHO flasher problems 99.9% are usually caused by bad earths or poor connections at the lamps |
Agreed: the flasher can is simply a thermal (Bi-Metal) strip which heats as load is applied ( 2 X 21 Watt bulbs = 42 Watts= 3.5 Amps) and heating causes the strip to bend which breaks the contact.
The Warning Lights are connected to each side circuit: i.e. near side and off side.
The feed is taken from the indicator switch and the feed is thus routed via the switch, to each side circuit of two bulbs, front and rear.
If the actual indicators are working and flashing correctly, then ergo, it must be a fault with the warning bulbs; as Phil states, poor earth.
Since what is happening is the warning lights are actually competing a circuit thru the front/rear bulbs, rather than direct to earth: and this separate mal-circuit suffers the resistance of two 42 amp bulbs (3.4 Ohms). Therefore, it is not surprising the warning lights only glimmer!
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