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Is this normal?

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Bob,

Here's a picture of the back side of a TR4A dash showing the black grounding wire for the center gauges. Sorry for the quality (focus especially) but I only had my cell phone with me.

Image0030.jpg


I checked the wiring harness in the car and there is a another eyelet connector with 3 black cables which would be the ground for the gauges. Not sure which post it would have been connected to but the ammeter would be a likely suspect.

Glad to hear that you have your problem fixed!

Scott
 
HerronScott said:
I think the black wires are the grounds for the gauge lights due to the wooden dash if I remember correctly.
Click to expand...
Ah yes, that would explain it. Sorry, I forgot the 4A had a wooden dash and separate gauge lamps. Apologies to all.
 
This is just one more story illustrating that contact oil/dielectric grease are necessary for an old Lucas system to soldier on in the 21st century. Just a little dab makes a huge difference on a 50 year old spade or bullet connector....
MD(mad dog)
 
And indeed, this is one of the areas where Lucas electrics fall short in quality compared to most. All other car makers plate their terminals with tin or similar, to prevent corrosion. Lucas just left theirs bare copper, which corrodes slowly just being exposed to air.
 
The prime reason I scream: "SOLDER!" :wink:
 
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