Mgb fuse box diagram. Locate the fuse block and check the fuse which joins a white and green wire. The fuse controlling your problem areas is the third one from the top. Let there be light fuses and relays hi all another battle with the prince of darkness the fuse box and lights horn switching is one of the common failure points on the mg electrical system. When i was cleaning my wiresfuse box connections i reconnected my fuel pump wire to the wrong terminal and it wouldnt work.
I started where i should always start. The link is on the back side of the fuse box. Diagram 3 6768 mgb from bentley e1898w fuse box b bg gb rear window defroster switch gt only radio n cigar lighter b h i g h b e a m s high beam indicator uw uw uw ur ur ur uw ur b b b b u dimmer switch rg g tachometer w distributor ignition coil wb f o n t p a r k i n g l i g h t s r t a i l l i g h t s l l i c e n s e p l a t e a m p. If you have removed the fuse box you have to properly orient the box so the link connecting two sets of terminals are at the top and toward the front of the car.
Thanks for any help. Since both brake lights went out at the same time it wasnt a bulb but it could be electrical. If the fuse was blown there is probably a fault in one of the circuits the fuse protects. Fuse box connections and colours for mgb gt 1972 7 5 3 1 8 6 4 2 all fuses are 17a current rated and 35a blow rated terminal 1 2 fuse a terminal 3 4 fuse b terminal 5 6 fuse c.
If you thought the fuse box for the vw bus was simple with 12 fuses the mgb fuse box will blow your mind. Next fuse up from bottom. John twist explains the electrical system for 1977 through 1980 mgbs. Brown wires are attached on the front side.
The fuse box is on the right passenger side front fender. Purple wires go on the rear side of the bottom fuse. I have had problems similar to yours. The problem could either be the front connection to the fuse or the connection between the fuse and the ignition relay which should be slightly to the front of the box.
I switched it to the correct one the third one and it worked again. Diary of an mgb monday november 14 2011. There are 4 fuses. Just below the fuse box is a line fuse for wiper motor heater fan and radio if fitted this fuse.
The only fuses i have seen is fuse box on inner fender. Looking at the electrical diagram to see what the circuit does. The third fuse is hot with the ignition on. The top two fuses are for lights on either side of the car.