[Mgs] Dash Light Problem

Barrie Robinson barrob at bell.net
Tue Aug 28 15:24:12 MDT 2018

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 <mailto:paulhunt73 at virginmedia.com>
> *Sent:* ‎Tuesday‎, ‎August‎ ‎28‎, ‎2018 ‎3‎:‎25‎ ‎AM
> *To:* daybell7 at aol.com <mailto:daybell7 at aol.com>, mgs at autox.team.net 
> <mailto: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 <mailto:mgs at autox.team.net>
>     *To:* mgs at autox.team.net <mailto: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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