Re: Diodes
I had the "run-on" problem with my '78 B. I put a diode in one of the
leads from the alternator (don't recall which one - I think the
yellow/brown). I think the details were in a "tech manual" put out by the
AMGBA. If you're interested, I'll try to dig out the info. Feel free to
e-mail me directly - rcgalli@ix.netcom.com.
Good Luck
Bob Galli
At 12:57 5/3/97 -0500, Ralph Watson wrote:
>Too many days ago (hey, I've been out driving!) Ross MacPherson wrote:
>>
>> At 08:14 PM 4/11/97 +0000, you wrote:
>>
>> >
>> >As well as grounds, there are potentially (ho ho) two diodes in
>> >late-spec USA cars that can cause all sorts of funny problems if they
>> >fail short-circuit. One diode is in the handbrake warning circuit
>> >(could be mounted behind the glove box) and the other is in the service
>> >interval counter. I think if the former fails it means you can't turn
>> >off the engine if the handbrake is on.
>> >
>>
>> I can verify this. The diode on the hand brake warning light went FUBAR on
>> my `76 and I could not shut off the car. Even with the keys in my lap in
>> burbbled happily along. Short term fix: don't engage the hand brake untill
>> the motor is stopped (I did this). Mid term fix: Disconnect the hand brake
>> warning light at the switch at the base of the hand brake lever (I did this
>> too) Long term fix: locate and replace the defective diode (I tried this
but
>> the diode was not on my wiring diagram and apparently invisible) YMMV
>>
>
>Indeed there are 2 diodes in the harness. physical location is behind the
center of the
>dash in the area totally obscured by the fresh air vent hoses. I got them
from TRF part
>#LU83225 (listed as a TR6 part) $11.90 each in Oct 1995. They are
larger than
>printed circuit diodes, I would estimate the two together would fit snugly
in a 35 mm
>film cannister. Location on the wiring diagram (bentley Complete Offical MGB
>1975-1980 page 240) is ref #256 upper left quadrant of page connected to
WR-GO
>wires and ref #284 bottom center of page connected to WR-GK wires. Note
that the
>terminals are appropriately "sexed" to prevent reverse polarity fitment.
>
>Ralph Watson
>75 MGB Roadster needs a new home
>76 FSU student
>77 Emory student
>early 1950's ex-wife unsexed terminal
>earlier 1950's girlfriend intensely sexed terminals
>in process of buying 1947 home for all of the above (except ex-wife).
>
>rwatson@netpass.com
>On a clear day we can see Disney World.
>Praying for fog.
>
>
>
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