Ammeter open circuit
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PMK 397F ran great to Silverstone and back. Just came to start it, no power. Batt ok, fault was wire to alternator had shorted to chassis and burnt right through. The consequence of this was the ammeter had blown like a fuse, hence no power to anything. Removed ammeter and joined the thick brown cables, all works fine.
Will be looking in autojumbles for ammeter in future.
Lucky it did not set on fire good old Lucas thought of everything.
Will be looking in autojumbles for ammeter in future.
Lucky it did not set on fire good old Lucas thought of everything.
- Elseezed
- Second Gear
- Posts: 153
- Joined: 28 Mar 2015
It might be possible to repair the ammeter.
The wire link inside the meter has probably blown like a fuse, leaving two ends looking at one another. If these ends are soldered together the meter will work once more. The soldered joint should not be too thick. or flow over the cut ends too much, otherwise the resistance of the link will be lowered significantly and the meter will under-read a bit.
The same thing happened to me over 10 years ago and my ammeter is still working OK.
Dave Chapman.
The wire link inside the meter has probably blown like a fuse, leaving two ends looking at one another. If these ends are soldered together the meter will work once more. The soldered joint should not be too thick. or flow over the cut ends too much, otherwise the resistance of the link will be lowered significantly and the meter will under-read a bit.
The same thing happened to me over 10 years ago and my ammeter is still working OK.
Dave Chapman.
- david.g.chapman
- Fourth Gear
- Posts: 804
- Joined: 26 Nov 2003
david.g.chapman wrote:The wire link inside the meter has probably blown like a fuse, leaving two ends looking at one another. If these ends are soldered together the meter will work once more. The soldered joint should not be too thick. or flow over the cut ends too much, otherwise the resistance of the link will be lowered significantly and the meter will under-read a bit.
Dave Chapman.
The link is a fuse! If it were a shunt then the ammeter movement would have been destroyed once the link broke.Too much solder short-circuits the fuse so removes the protection.
Meg
26/4088 1965 S1½ Old and scruffy but in perfect working order; the car too.
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26/4088 1965 S1½ Old and scruffy but in perfect working order; the car too.
________________Put your money where your mouse is, click on "Support LotusElan.net" below.
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Quart Meg Miles - Coveted Fifth Gear
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