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No brake lights/fuel gauge/engine temp or wipers

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No brake lights/fuel gauge/engine temp or wipers #1
stuart sinclair honiton, UK Sign in to contact 1951 MG TD "Mixed Breed" 1979 MG MGB GT	Topic Creator (OP) Apr 24, 2014 02:04 PM Joined 11 years ago 843 Posts

On The 79 bgt is there a voltage gizmo, I have gone through the connectors and earthing points ?

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Re: No brake lights/fuel gauge/engine temp or wipers #2
RAY 67 TOURER Ray Marloff Fort Bragg, CA, USA Sign in to contact 1967 MG MGB "My Girl"	Apr 24, 2014 02:07 PM Top Contributor Joined 14 years ago 17,490 Posts

Yes, but it's unlikely to be the fault of your problems. I'd check the ignition switch, and the surrounding wiring, looking for an interruption in the current. RAY

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Re: No brake lights/fuel gauge/engine temp or wipers #3
rntanner Roger N. Tanner (Disabled) Oxnard, CA, USA Sign in to contact 1970 MG MGB 1977 MG MGB	Apr 24, 2014 02:10 PM Joined 15 years ago 4,348 Posts

First, bring up this file:

http://www.advanceautowire.com/mgb.pdf

Open the file up to sheet 25, 1978 and later MGB

"All those green wires on the upper right quadrant draw power from the fuse (5) - (6)"

I would start at that fuse, and work your way to finding where the "power" stops.

Roger N. Tanner
Professional Engineer, Retired

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Re: No brake lights/fuel gauge/engine temp or wipers #4
Lug Nuts 34 John M Portland, OR, USA Sign in to contact 1980 MG MGB MkIV "The B"	Apr 24, 2014 04:44 PM Joined 10 years ago 149 Posts

I have almost the same problem with my car, an '80: the reverse lights for a long time didn't work, but now sometimes do, the brake lights sometimes do, but more often don't, and the fuel gauge always reads empty. I'm pretty sure that the brake/reverse light issue is from the corroded fuse box. I read that many odd electrical problems can be fixed with a replacement fuse box. Our wipers work, though.

Best luck in diagnosing the problem.

The "B"udget: staying solvent with glues and aerosols.

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Re: No brake lights/fuel gauge/engine temp or wipers #5
stuart sinclair honiton, UK Sign in to contact 1951 MG TD "Mixed Breed" 1979 MG MGB GT	Topic Creator (OP) Apr 25, 2014 04:30 PM Joined 11 years ago 843 Posts

What we found was that if you move a fuse to the edge of the fuse holder it makes contact,But center it and it looses current. So next weekend or soon after i will take it abroad and see if i can get the contacts to tighten up !

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Re: No brake lights/fuel gauge/engine temp or wipers #6
NNN Norman Nalepa FL, USA Sign in to contact 1970 MG MGB MkII "ANNA" 1979 MG MGB "Chick Mobile"	Apr 26, 2014 07:59 PM Joined 14 years ago 2,705 Posts

BAd fuse

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Re: No brake lights/fuel gauge/engine temp or wipers #7
Nicecar Gary (ex "Harv") G Victoria, BC, Canada Sign in to contact 1980 MG MGB "Red On Red On Red"	Apr 27, 2014 02:49 AM Joined 13 years ago 8,390 Posts

Though I've never had electrical problems, I just pulled my fuse box (and some other relays) and gave them a good clean. My concern was using Vaseline on contacts. Much advice that this and dialectic grease is non conductive, and after some Internet searching, found MG Chemicals has "Nu-trol Control cleaner" (found 2 in my home) with lubricating oils (#401B-140G) that my old can says is conductive, but new can doesn't say. I called the company and pointed this out. It's the same formula as before but dumb marketing / labeling omitting the conductive factor now.

Be careful, as they also sell products that are non conductive.

Electronic supply stores carry it. It's Canadian and can only assume it's for sale in USA too.

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