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Light issue very strange, it's like the xfiles

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Light issue very strange, it's like the xfiles #1
Rowly2210 Andrew Rowlands Swansea, Wales, UK Sign in to contact 1975 MG MGB GT "Vince"	Topic Creator (OP) Aug 28, 2015 12:53 PM Joined 10 years ago 91 Posts

hi guys need some help I finally got vince running after changing the points, which was a relief but now my front drivers side small light doesn't work nor my rear passengers light either. What the hell is going on?

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Re: Light issue very strange, it's like the xfiles #4
Mustangsix Jack Collins Oviedo, FL, USA Sign in to contact 1969 MG MGC GT 1973 MG MGB GT	Aug 28, 2015 01:42 PM Top Contributor Joined 13 years ago 5,869 Posts

Left and right running lights are on separate fuses. Look to see if one of those is blown.

Ceres Motorsports, LLC. www.ceresmotorsports.com

Ceres Motorsports specializes in the repair, restoration, and customization of classic British cars including MG, Triumph, and many other makes.

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Re: Light issue very strange, it's like the xfiles #5
danmas Dan Masters Alcoa, Tennessee, USA Sign in to contact	Aug 28, 2015 01:51 PM Top Contributor Joined 18 years ago 2,306 Posts

In reply to # 3071863 by Mustangsix Left and right running lights are on separate fuses. Look to see if one of those is blown.

On some MGBs I've seen, the LF and the RR are on one fuse, and the RF and LR are on the other. On others, the left side is on one fuse and the right side is on another. This is original factory wiring. No, I have no explanation for the differences.

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Re: Light issue very strange, it's like the xfiles #6
tomgrigsby Tom Grigsby Ivor, VA, USA Sign in to contact 1971 MG MGB GT "The Blight" 1979 MG MGB "The NewB"	Aug 28, 2015 01:52 PM Joined 14 years ago 653 Posts

In reply to # 3071822 by Rowly2210 hi guys need some help I finally got vince running after changing the points, which was a relief but now my front drivers side small light doesn't work nor my rear passengers light either. What the hell is going on?

One of my cars has right front and left rear on same circuit - the spade connectors are reversed at the fuse box for fuses 1 and 2, and I've never bothered to fix it. Probably a dirty connection right there at the fuse box since that's the only common point for 1 front and 1 rear running light. Here's the wiring diagrams - just go to your model year. Red circuit from fuses 1 and 2 feed all these running lights.

mgb color wiring diagram.pdf 1.43 MB

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Re: Light issue very strange, it's like the xfiles #7
mgbanthony Anthony Henderson Eastern Thousand Islands, ON, Canada Sign in to contact 1962 MG MGB 1974 MG MGB	Aug 28, 2015 02:49 PM Top Contributor Joined 18 years ago 13,242 Posts

What Dan and Tom said, plus who knows what a PO did. It sounds like one of the 2 upper fuses in the panel is not doing its job. One controls half the running lights and the other, the other half.

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Re: Light issue very strange, it's like the xfiles #8
Monsantiqu Anthony S Kodak, TN, USA Sign in to contact 1975 MG Midget	Aug 28, 2015 05:34 PM Joined 9 years ago 1,649 Posts

Dominick, take a day off, turn off your phone, and request that your wife not bother you.
Check, clean, sand, wire brush, coat with dielectric grease, and tighten EVERY ground connection in your car.
Disconnect associated male bullet connectors. Dremmel wire wheel clean till shiny.
Clean female bullet connectors with round file and/or sandpaper.
Reconnect firmly and with a snap after applying dielectric grease.
Of course after you check fuses and bulbs.......
Better than brand new and you will tip your hat in honor of Mr. Lucas!

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Re: Light issue very strange, it's like the xfiles #9
DonW Don Walton Galax, VA, USA Sign in to contact	Aug 28, 2015 06:49 PM Joined 18 years ago 1,006 Posts

I just went through my lighting circuits and cleaned all the connections and I replaced the female connectors because I kept finding them cracked. A great many problems went away when finished. Easy fix and connectors are cheap! Good luck!

Don Walton in Va mountains

73 B
74 B

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Re: Light issue very strange, it's like the xfiles #10
rntanner Roger N. Tanner (Disabled) Oxnard, CA, USA Sign in to contact 1970 MG MGB 1977 MG MGB	Aug 28, 2015 07:13 PM Joined 15 years ago 4,348 Posts

Buy a sheet of Scotch-Brite™ Scuff Pads

Example:

http://www.goferauto.com/64926.html

Your local auto supply and/or some hardware stores will have these in singles

64926 Scotch-Brite™ "7447 PRO" Hand Pads, Very Fine grade, 6 in x 9 in, 64926. "Upgrade" from the 7447 Maroon Pad. "Lasts longer".

Roger N. Tanner
Professional Engineer, Retired

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Re: Light issue very strange, it's like the xfiles #11
TonyV Tony V Rutherford, NJ, USA Sign in to contact 1974 MG MGB	Aug 28, 2015 08:50 PM Top Contributor Joined 9 years ago 2,545 Posts

If Sully is coming forget the damn car!! smiling smiley

In reply to # 3071827 by BumbleB74 go clean some connectors, tends to cure such things. Or call Scully….

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Re: Light issue very strange, it's like the xfiles #12
Rowly2210 Andrew Rowlands Swansea, Wales, UK Sign in to contact 1975 MG MGB GT "Vince"	Topic Creator (OP) Aug 30, 2015 08:50 AM Joined 10 years ago 91 Posts

Cheers guys problem sorted. Gutted though cause I didn't need scully

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Re: Light issue very strange, it's like the xfiles #2
BumbleB74 William Milholen Tidewater, Tidewater VA, USA Sign in to contact	Aug 28, 2015 01:01 PM Joined 18 years ago 8,982 Posts

Re: Light issue very strange, it's like the xfiles #3
ClayJ Clay Johnston Mt. Olive, MS, USA Sign in to contact 1972 MG MGB	Aug 28, 2015 01:03 PM Top Contributor Joined 18 years ago 17,656 Posts

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