Okay, I know this has been partially addressed in another tread, but not entirely.

I recently had a problem getting my 1990 Sovereign (manufactured late '89) to start. After checking out a myriad of relays and other possibilities I found the problem was water in the fuel tank. So I got everything put back together and now the instrument panel lights and tail lights do not work. I have brake, directional indicators, and reverse lights. The headlights work fine. None of the instrument panel lights up. This is not an intermittent thing as some people have experienced. It's all the time.

I have removed the dash scuttle and tried swapping out the relay modules one by one, including the black relay on yellow base. No luck at all. Does anyone have any idea what I should try to get either the instrument panel or tail lights working? It has a habit of getting dark every night around my neighborhood and I would like to drive in it. Any help would be appreciated.

 

I see this thread is ancient, but I am having the same problem on my 1990 Sovereign.

Any fixes?

Thanks, IroqRT

 

yes my panel lights dont work

 

Mickvic, Don B gave me a wiring diagram.

http://www.jagrepair.com/images/Elec...Electrical.pdf

By those diagrams I found that the only common switch shared by all tail, marker, and dash lights was the master lighting switch on the steering column. I disassembled the switch and found a heavily corroded circuit board inside. Wiggling this board causes the lights to flash on and off so there is an obvious bad connection. I took the board out and cleaned it but could not further isolate the problem or stabilize the connection. I have ordered parts to replace the master lighting switch and board. When I get them I will confirm.

Thanks, IroqRT

1990 XJ40 Sovereign

 

Well my tail lights work but the dash is out. Cant see that wiring link. Is there a relay connected with the dash wiring?

 

I re-attached the wiring diagram here for download.

I have also included pictures of the parts I replaced to repair my lights. There are a couple of circuit boards behind the master light switch that were faulty.

These parts are currently available on ebay for $150 or less. The parts are a little hard to locate because no one seems to know what to call them - but they are there..

 

If it's a bad connection, as it can sometimes be, a good smack on top of the binnacle can sometimes bring the dash lights to life - temporarily.

Larry

 

I do have a nos light logic module.... hmmm