TR6 Amperage leak?

[edkap2002]

Why does my 72 Tr6 suffer a slight battery charge loss during periods of storage…..car has no chips or computers or ECUs…,,where can the leak be found?

 

[mezy]

If you disconnect the positive off the battery and connect an ohm meter from negative to the positive cable ( not the battery possitive ) .
This will show if there is anything turned on pulling the battery down. If there is it is just a case of disconnecting stuff to find what it is.
My first choice would be alternator. I have known a bad alternator take a battery down.

 

[NutmegCT]

Also - batteries lose charge over time, even just sitting on a shelf. The chemicals inside gradually "eat away" at the hardware, causing loss of charge. It's not necessarily because of a "drain" caused by a connection to the battery.

 

[Sarastro]

You can also check for a current drain by disconnecting the battery terminal and inserting an ammeter between the connections, ignition off. Use a multimeter, not the dashboard ammeter, as the latter is not precise enough. If you see an indication, start disconnecting things until the current drops to zero; that is the circuit with the problem.

A parasitic current drain is not uncommon in these cars. Also, as noted above, the self-discharge rate can become high enough, in an older battery, that it will go flat in a week or so.

 

[StagByTriumph]

Several things to check, one is your Alternator regulator could be leaving a voltage on the "field" and not lighting the IGN light or it my be on real dim.

Also, if you have a modern radio fitted, those typically draw some current while "off" to keep the clock and stations.