Smiths 30A ammeter

[1795]

Glen,

Whatever you do, make sure that it is done in a way that can be un-done just in case you have to replace the gauge. It would really suck to have to remove the whole dashboard to replace a gauge. Remember that there will be little room to work with once everything is all together.

Good luck.

Jim

[scootter]

Just a thought. I just removed my amp meter since I had a meltdown under the dash a couple weeks ago. Replaced it with the volt meter that uses small gauge wire and rewired the alternator and fuse panel.
https://www.amazon.com/photos/shared...N6DkNpDAfUmvNT

[rsk289]

Yes, the unprotected ammeter wired directly into the main live cables behind the dash is a bit of a worry. I have a Dynator - an alternator hidden in a dynamo casing. This is a Lucas C40T type, with the rear take-off for the cable-drive tachometer. Running this alternator means the Lucas control box no longer contains the bobbin voltage regulator apparatus. The control box now acts as a junction box, and includes a whole-system 60A fuse. This protects the wiring harness including the ammeter.

[xb-60]

Originally Posted by rsk289

Yes, the unprotected ammeter wired directly into the main live cables behind the dash is a bit of a worry. I have a Dynator - an alternator hidden in a dynamo casing. This is a Lucas C40T type, with the rear take-off for the cable-drive tachometer. Running this alternator means the Lucas control box no longer contains the bobbin voltage regulator apparatus. The control box now acts as a junction box, and includes a whole-system 60A fuse. This protects the wiring harness including the ammeter.

It is possible that I might be able to legally "de-smog" my 302 after registration, and if so, it was my intention to fit a Lucas C40 generator. I hadn't previously heard of the C40T; I'll have to look into that.

Cheers,
Glen

edit: just looked at the pricing....these units are around the GBP500 mark

[rsk289]

Yes Glen, accuracy doesn't come cheap!

The modifications, rebuild and new dial face for the Sunbeam Rapier or early MGA cable-drive rev counter to Cobra spec doesn't come cheap either!

Before and after:

[xb-60]

Nice job there
Which Cobras had 10000 RPM Smiths tachometers?

[rsk289]

Dan will probably know for sure, but this one is copied from the mechanical tacho in COB6029, the Haynes Museum car -a leafspring rack and pinion.

[xb-60]

Originally Posted by scootter

Just a thought. I just removed my amp meter since I had a meltdown under the dash a couple weeks ago. Replaced it with the volt meter that uses small gauge wire and rewired the alternator and fuse panel.
https://www.amazon.com/photos/shared...N6DkNpDAfUmvNT

Yes, a voltmeter is the safer option, but I'll stick with an ammeter for originality. I do however have an electrical cutoff switch in a very handy spot for "insurance"

Cheers,
Glen

[xb-60]

Originally Posted by 1795

Glen,

Whatever you do, make sure that it is done in a way that can be un-done just in case you have to replace the gauge. It would really suck to have to remove the whole dashboard to replace a gauge. Remember that there will be little room to work with once everything is all together.

Good luck.

Jim

Jim, I very much understand what you're saying. I'm resisting fitting the two temp gauges until the engine is in and the wiring is done because, being bourdon tube gauges, it would be a real pain to have to remove the dash panel if those two gauges were fitted. The ammeter should be adequately accessible.

Cheers,
Glen