Can anyone tell me...?

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Thrasher07
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Can anyone tell me...?

Post by Thrasher07 » 05 Jan 2016 11:04 pm

What is pin 48 on the back of the fusebox for 1.7? Mine has melted, and since then, my lights are stuck on normal beam on settings 0, 1 and 2!
1989 1.7 GL, 38k - Old, yet still a baby!

Ride_on
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Re: Can anyone tell me...?

Post by Ride_on » 05 Jan 2016 11:50 pm

I think new posts are meant to go in the appropriate sub-section. I didn't know the fuse box had numbers, except for the fuses. Car manufacturers don't seem to use connector pin numbers annoyingly.

Anyway what colour is the wire it goes to and which side is it (engine bay or passenger compartment)?
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

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Thrasher07
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Re: Can anyone tell me...?

Post by Thrasher07 » 06 Jan 2016 01:40 pm

Ahh, sorry :( Can anyone move this post? It's not on the fuse side, it's on the back where everything from the dash plugs in. The plug is a brown one and I believe the wire was yellow
1989 1.7 GL, 38k - Old, yet still a baby!

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bogbasic
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Re: Can anyone tell me...?

Post by bogbasic » 06 Jan 2016 04:28 pm

That's the one that burnt on mine. Can you clean it up (i.e. both the male and female sides of the connection) and get it going again? Also, if you can get hold of some spare second-hand headlamp relays, a bit of relay-swapping can help to solve this sort of problem without too much brain-aching about the details of the circuit, etc. There is a full wiring diagram in the technical section, but its a bit of a mare, although a fabulous resource. Do you have a Haynes manual to identify the headlamp relays? One of them has a fancy heat sink and its probably on the bulkhead? There is another low power relay or two somewhere else - others will know...
1988 340 1.4 GL, 218k, 5 door (Grey Bess). Gone to CBA.
1991 340 1.7 GL, 64k, 5 door, petrol blue (Deep Blue).
1988 360 2.0 GLE, 140k, 5 door, ocean blue metallic (Blue Bess).
1989 340 1.7 GL, 108k, 3 door (Red Ness).
More info here!

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thododd
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Re: Can anyone tell me...?

Post by thododd » 06 Jan 2016 04:43 pm

I only know of the one headlight relay, the 5pin(?) Heatsink'd one in the engine bay. If theres any more they must be behind the dash before the fusebox (???)

Ride_on
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Re: Can anyone tell me...?

Post by Ride_on » 06 Jan 2016 08:50 pm

1986 on? You need to be precise about the colour or trace it to something you can identify in a diagram.

There is a yellow wire that goes to the headlight switch pin 4, seems to be the main +12 feed direct from the battery. Why it should turn the lights on in position 0, I don't know. It should be open circuit but it is connected to the bridge relay (2.2).
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

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Thrasher07
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Joined: 01 Sep 2015 06:39 pm
Location: Isle of Wight

Re: Can anyone tell me...?

Post by Thrasher07 » 07 Jan 2016 11:12 am

Sorry for late reply, bit limited on Internet...

Anyways, I have bought another fusebox to put in. Interesting that it's the same pin that burns out. Also got a relay with the "new" fusebox. We built the pin in the old box back up with solder, which stopped my ignition going (started to cut out if I touched the lights) bit still left with the lights issue. MOT next month too! Hope the new fusebox and relay will solve the issue.

Car is 1989. Have got the manual, but diagram is a bit of a nightmare!
1989 1.7 GL, 38k - Old, yet still a baby!

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bogbasic
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Re: Can anyone tell me...?

Post by bogbasic » 07 Jan 2016 12:32 pm

Hello, great. Can you find the black headlight relay with the heat sink and check the connections are OK and then give it a gentle tap with something not too heavy? Maybe the relay is stuck 'on' and a rattle is all it needs to free it up??
1988 340 1.4 GL, 218k, 5 door (Grey Bess). Gone to CBA.
1991 340 1.7 GL, 64k, 5 door, petrol blue (Deep Blue).
1988 360 2.0 GLE, 140k, 5 door, ocean blue metallic (Blue Bess).
1989 340 1.7 GL, 108k, 3 door (Red Ness).
More info here!

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Thrasher07
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Joined: 01 Sep 2015 06:39 pm
Location: Isle of Wight

Re: Can anyone tell me...?

Post by Thrasher07 » 07 Jan 2016 01:50 pm

I will try this!
1989 1.7 GL, 38k - Old, yet still a baby!

Ride_on
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Location: Belfast, N. Ireland

Re: Can anyone tell me...?

Post by Ride_on » 07 Jan 2016 08:12 pm

The 'relay' with the heatsink, is not a relay AFAIK. Its is a switched mode circuit that switches on/off rapidly to reduce the power to the light (dim dipped lights) without having to use a resistor to drop the voltage. I think it is only used with pos 1 and ignition on. You can unplug it and the lights mostly work fine.

In my 360 I'd left it a bit loose on the ground point used by this module and the hoop/screw was vibrating and noisey. When I tightened it up one of the fuses still had a bit of a whine when on pos 1 and I could feel it with my finger. Not sure if this normal, but high frequency highish power signals are a bit unusual in cars and I wonder if this is responsible for the melting contacts. I don't know the electrical theory behind it, just have a feeling in my water :) Maybe time to breakout the thermal camera.

Do you use the side lights much/recently before the fault?
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

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Thrasher07
Posts: 25
Joined: 01 Sep 2015 06:39 pm
Location: Isle of Wight

Re: Can anyone tell me...?

Post by Thrasher07 » 07 Jan 2016 11:18 pm

No, not really. It all came about quite suddenly.
1989 1.7 GL, 38k - Old, yet still a baby!

Ride_on
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Joined: 26 May 2009 05:34 pm
Location: Belfast, N. Ireland

Re: Can anyone tell me...?

Post by Ride_on » 08 Jan 2016 02:32 am

Well just to play with my new toy I captured a thermal image of the fuse box, lighting pos 1 and ignition on.

The noisey fuse does indeed get hot (40C) as does the dim dip relay however the yellow wire or connection did not, So I think that eliminates it from enquiries.
dim dip engine.jpg
Thermal image of dim dip mode
dim dip engine.jpg (445.65 KiB) Viewed 2812 times
Also checked the dip dip relay (it says relay on it but it doesn't click) disconnected, all you lose is the dim dip mode, which I don't think is really needed.

The melted plastic could have allowed a short inside the fuse box.
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

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Thrasher07
Posts: 25
Joined: 01 Sep 2015 06:39 pm
Location: Isle of Wight

Re: Can anyone tell me...?

Post by Thrasher07 » 08 Jan 2016 11:11 am

That picture is amazing to see! Thanks! This group is the best! :D I'm really hoping the problem lies inside the fusebox, and I'm fitting it today, so we will see what happens!
1989 1.7 GL, 38k - Old, yet still a baby!

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bogbasic
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Re: Can anyone tell me...?

Post by bogbasic » 08 Jan 2016 01:55 pm

Wicked photography, but what else are you planning to do with your thermal imager ;-?
1988 340 1.4 GL, 218k, 5 door (Grey Bess). Gone to CBA.
1991 340 1.7 GL, 64k, 5 door, petrol blue (Deep Blue).
1988 360 2.0 GLE, 140k, 5 door, ocean blue metallic (Blue Bess).
1989 340 1.7 GL, 108k, 3 door (Red Ness).
More info here!

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Chris_C
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Re: Can anyone tell me...?

Post by Chris_C » 08 Jan 2016 05:47 pm

Before you get too excited, check the connector as well (and the contact inside the connector)

viewtopic.php?f=56&t=9808

If that is corroded (which is very likely if you have a melted fuse box pin, it will just do the same thing again, really quickly. Don't ask how I know :(

On the plus side, they are super easy to fix with a new crimp
'89(F) 340 GL F7R (ex B172k) - Fake -> SBKV 300 Runner Up 08, 12 - NASLR Time 15.7secs
'03 S60 D5 SE, '91 (J) MX5
Ex:
'91(H) 340 GL B14.4E - Kar; '88(F) 360 GLT B200E - Jet -> BKV 300 Runner Up 09; '89(G) 360 GLT B200E - Beast

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