I have a 72B; bought a couple months ago. I have zero dash lights. Ideas on where to start troubleshooting? ... See MoreSee Less
1 week ago
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Minimal lighting is normal. Check the rheostat knob to be sure that they are not fully dimmed.
First thing I would do is label your wires at the fuse block, remove it from the car and sandblast it or take a good wire brush to the block, then put it back on and reattach the wires.
Check the rheostat first, some of the B's had an inline fuse for the panel lights.
Even if they work, which mine do, they barely illuminate the gauge anyway😀
I have a completely black dash at night. Has anyone seen LED's for the dash?
Do you really want to know what those gauges are reading?
Start with the wiring diagram for your car. www.advanceautowire.com/mgb.pdf Assuming someone has not tried to rewire your car, the black wires are ground wires. Clean the ground points on the car. I just bypassed the rheostat on my car, most of them don't work after a few years. Disconnect you battery if you are going to take things apart. Don't let the smoke out of the wires. Remember brown wires in the MGB are always hot.
I know this sounds weird but I think all the he electrics feed through the cigar lighter.
Disconnect the reostat, connect all wires red/white, from the reostat check instruments have a good ground.
I tried getting my meathooks up behind the dash. I could barely reach and touch the back of the dimmer with my fingertips. I know I only need to move one of the connections over to the other side of the switch, but darn could not reach it enough to disconnect. Side issue, busted a couple of the seat webbing by putting my weight on my elbows on the corner of my seat. Now there is that to deal with.
Fuse block and a wire brush
I would check the bulbs first. No point in doing all the wiring, fuses and reostats if the bulbs are all dead or even missing
New fuse block $10.00 Moss
Bypass the rheostat. Full bright is still fairly dim.
Update - Problem solved. Turns out my headlight switch decided to self destruct, pushing me to place an order for both headlight and dimmer switches and a couple of seat webbing kits as well. I had busted through a couple of straps by placing too much weight on my elbow on the corner of the driver seat attempting to reach up under the dash to try to bypass the dimmer plugs. Anyway... I now have the notoriously dim dash lights! Took a long drive at dusk to check out my handiwork. Now to make plans to buy LED's. Thanks for all the suggestions.
Our pleasure to advise help and suggestions.
Give us a week or so for our Brains to recover, lol.
David Johnson when I replace diagrahms I replace the seat cussons, Diaphrams and the straps that go on 1977 t0 1980. The straps I have to drill a few more holes but in the end I have a firmer ride.
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