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Re: 75B electrical fun

To: "MG List" <>
Subject: Re: 75B electrical fun
From: Max Heim <>
Date: Mon, 2 Aug 1999 14:41:07 -0700
My experience with the turn signals was twofold.

First, I removed the column surround to examine the switch mechanism. In 
my case, the nylon (white plastic) from which the switch is constructed 
was severely deteriorated, crumbling to the touch, and several small 
components had become detached. So I was forced to buy a new switch.

Secondly, even after replacing the switch, I had symptoms similar to what 
you describe. I replaced the flasher unit to no effect. I then traced the 
turn signal wiring both to the front and rear of the car, unplugging and 
cleaning all connectors. At this point I discovered that many of the 
double-female bullet connectors were seriously corroded, and 
disintegrated when I attempted to pull them apart. Finally, after 
cleaning or replacing all the connections, as well as the bulb sockets, I 
had functional turn signals.

I think the story here is that the amount of resistance in the wiring is 
critical to the flasher operation; in other words, corroded connections 
that may still function for a constant load (such as parking lights) 
create too high a resistance for the proper operation of the flasher 
unit, preventing the turn signals from blinking.

I'm not sure, but I think the hazard flasher may be a separate unit (my 
'66 doesn't have a hazard light circuit). As for your tach, I'd check the 
wire connections on the back and at the coil. Possibly one is just loose.

Hope this helps.

Scott/Michelle had this to say:

>Hello to the list!
>I have been on my vacation for the past few weeks, and my pc has been down.
>While off work I finally got my B on the road...or almost, after four plus
>years of sedentary rotting she finally came to life. Much to my dismay the
>master cylinder and slave must be order to get her to stay in
>gear!..or out of the case may be.<LOL> 
>Now, the tachometer runs every now and then, and I can't seem to get the
>turn signals to run. The hazzards work, the headlights work, the dash lights
>work, and so on, but no turn signals. Does anyone have a Lucas insight
>here??? I have no clue as to why they wont go, I have replaced all of the
>fuses on the fuse block....with 20 amp fuses,...17 amp arent readily
>available. I have yet to take the stick apart...due to sheer fear of what i
>might if anyone could give ne an insight I would greatly appreciate
>it!!! Is there an inline fuse for these items that I missed...or perhaps it
>is in the column...and i haven't seen it yet? the 100 plus degree weather
>keeps me away during most daylight hours, so trouble shooting here saves me
>stinging sweat in the eyes. <LOL>


Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.

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