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  #1  
Old April 29th, 2011, 08:23 PM
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Neill Thornton
1984 D90 300 Tdi / 1965 Series IIA
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Mystery Box / ECU

OK guys, here is one for you...

I was pulling my dash apart today in my '84 Tdi, and found a complete clusterf**k of rats nest behind the dash. I am starting to clean it up, and have identified pretty much everything except for a mystery metal box that just says "Lucas Made in UK 12V T", and the numbers "37801B 3590" stamped into it.

5 wires going in that all come from the main dash harness into the truck somewhere.

Wire colors (no guarantee they are original) are:
Heavy gauge Green
Heavy gauge Blue/Red
Red
Blue/White
White/Green

I tried ringing out the pins to see if anything was ground, etc. I am getting various resistances on several wires.

I know it's NOT the flasher relay or rear window heater relay. The headlamp dim/dip relay has way more pins.

I opened the front up and it has a bunch of resistors, a few capacitors, and a few transistors inside. No computerized anything. Picture of the connector and box is attached.

Does anyone have an idea what the hell this thing is??
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  #2  
Old April 29th, 2011, 09:14 PM
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Mike
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British standard wiring colors, may or may not apply...
Green Ignition control
Blue/red Headlight low beam
Red sidelamps, lights
Blue/white Headlight low beam
White/green Fuel Pump changeover switch?? Could only find this color on the Td5's

Could it be an alarm control?
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Old April 29th, 2011, 09:15 PM
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Daniel Hayes
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Just a guess, but looking at the pronounced cooling fins, it looks as if it is an amplifier of some type (stereo?) or a power converter (DC ->AC).
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  #4  
Old April 29th, 2011, 10:22 PM
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Quote:
Originally Posted by dsh12 View Post
Just a guess, but looking at the pronounced cooling fins, it looks as if it is an amplifier of some type (stereo?) or a power converter (DC ->AC).
x2 power converter of some sort
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Old April 29th, 2011, 10:54 PM
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thomas
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When looking at the wiring diaram for the 10J and the 12J that does not seem to be there..

Is it possible that it is part of the stereo? Maybe it conditions the line going in to reduce "niose"...I assume you have the Haynes manual for the truck.. If not I could scan in the diagram for you. Let me know
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Old April 29th, 2011, 11:34 PM
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Neill Thornton
1984 D90 300 Tdi / 1965 Series IIA
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Yeah guys I have all the manuals... it's an 84 chassis with a 90s era Tdi, Classic drivetrain, Disco axles... we call it the "frankenrover". So I have all the RAVE CDs plus the two applicable "official" Defender CDs. Nothing has anything like this in it.

It's not part of the radio. It's clearly power related, it has two large transistors that bolt on to that heat sink inside. I thought it might have been the glow plug ECU, but that's under the bonnet.

I am tempted to just plug everything back in except that and see what doesn't work.

------ Follow up post added April 29th, 2011 08:36 PM ------

Also, the picture kind of makes it look out of scale. It's not large, maybe 2/3 the size of a deck of cards.
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Old April 30th, 2011, 12:07 AM
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Neill Thornton
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Also I forgot to show the other side....
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Old April 30th, 2011, 12:22 AM
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Neill Thornton
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All, problem is solved thanks to me digging through MicroCat.

It's the "Dim Dip Transformer", used to produce a Daytime Running Lamp type effect by lighting the headlamps at 10-20% of normal when the headlamp switch was off.

It's part number PRC 6336.
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Old April 30th, 2011, 08:13 AM
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Jamie Austin
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I just caught this thread... indeed that is the dim/dip unit.

Certain years over here (And europe I think) had to have 1/6th brightness headlights illuminated if you just had "side lights" switched on and was driving (hence the ingition control on the switch box)

The box you have shown is the early one (about 1989 I think). It was stopped until about 1992 (my 1992 Tdi had the newer type relay, which was red and plastic, and had the resistor under the RH wing in a big metal casting to keep it cool)

It's been fitted on and off over the years, depending on rules I suppose.
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