[Mgs] Dash Light Problem

i erbs eyera3000 at gmail.com
Tue Aug 28 20:36:51 MDT 2018


Classic speed has a great product for speedos
https://www.classicautoinnovations.com

Ira Erbs
Portland, OR
typos and artifacts are the fault of my phone

On Tue, Aug 28, 2018, 7:13 PM Barrie Robinson via Mgs <mgs at autox.team.net>
wrote:

> Hello Steve,
>
> Neither my speedo nor tach are working well and when checked out found it
> was the heads.  Pricey replacements !   As my MGB GT V8 is not really
> original it did not take me long to find Speedhut replacements.   They have
> a good selection and a brilliant web site to "build" you own gauge.   Mine
> will be very very close to the original but with far better performance and
> features.  The speedo is GPS driven - my oath - and has no connections to
> the car (except for Lucas smoke to drive the light bulbs). Trouble is that
> when I  fit them I will no longer go from 0 to 45-55kph in less than 3 secs
> with engine ticking over at 500rpm.:-)
>
>
> On 8/28/2018 7:27 AM, daybell7--- via Mgs wrote:
>
> Thanks, Paul.  I’m checking dash ground first thing after much
> good advice, especially about not assuming it’s OK.   Both indicator lights
> work.  My tach was acting funny.  The car ran fine, but the tach never
> registered over 3k RPM.  Thanks for the good info, Paul and everybody else.
>
> Steve H.
> Gainesville, FL
>
> *From:* PaulHun <paulhunt73 at virginmedia.com>
> *Sent:* ‎Tuesday‎, ‎August‎ ‎28‎, ‎2018 ‎3‎:‎25‎ ‎AM
> *To:* daybell7 at aol.com, mgs at autox.team.net
>
> Usually the first step would be to bypass the dimmer rheostat, which may
> not be as easy on a padded dash as on the UK dash.  They usually have
> double spades for each connection, with two wires in a single spade on each
> connection, so it is a relatively simple test to move one of the
> connections across to the spare spade for the other connection.
>
> Have you tested the bulbs work out of the sockets?
>
> All the gauges should have earth wires on a 72, you can't assume the dash
> is earthed.  There should be a black wire under the fixing nuts that hold
> them in the dash, or could be a spade on the back of the tach case.  That
> is fed from a 4-way bullet connector that also feeds the right-hand
> indicator tell-tale, does that work?  The left-hand is fed differently.
>
> Does the tach work as it should?  If so that would appear to have a good
> earth and it's bulb should work at least.  Are you looking at them in low
> light levels?  You won't see gauge illumination if the ambient conditions
> are bright.
>
> Did you only have one bulb unscrewed when you tested for 12v in the socket
> and all the other bulbs screwed in and fitted?  You need to, especially if
> your test light has an LED or you use a voltmeter.
>
> Take each socket out of the gauge and earth it with another wire.  Make
> sure your earth wire is good, can your test lamp check earths as well as
> 12v?
>
> PaulH.
>
>
> ----- Original Message -----
> *From:* daybell7--- via Mgs <mgs at autox.team.net>
> *To:* mgs at autox.team.net
> *Sent:* Monday, August 27, 2018 6:08 PM
> *Subject:* [Mgs] Dash Light Problem
>
> The dash lights don’t work on my 1972 MGB.  The trouble lite will light
> when I test the sockets, but various new bulbs won’t.  Does this mean low
> voltage?   I’ve grounded the test light on a bolt and assume the dash is
> grounded.
>
> Thanks,
> Steve Hughes
> Gainesville, FL
>
>
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