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Willie

AMMETER WIRING WITH ALTERNATOR

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Hi Folks, yesterday I renewed the battery on my '64 TR4 and the guy tested the battery under load [engine running, lights on]. It gave 13.8 volts so all well. However, the alternator conversion is causing the ammeter to give a significant apparent discharge. Does anyone have details of wiring which correct the ammeter reading to include alternator input? Pic attached of the ammeter with engine running and lights on.

 

Best wishes Willie

post-12067-0-68313000-1532519606_thumb.jpg

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The ammeter should go between the battery (pick up on the starter solenoid terminal) and everything else (including the Alternator O/P) except the Horns. (& starter motor obviously)

 

Bob.

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There could be two things happening here Willie.

The first is that the connections to the ammeter have not been reversed after the alternator installation so they are still set up for positive-earth. That would mean your apparent discharge is actually a charge. That is also not right of course but this can happen if the load (in your case the light circuit) is wired to the battery end of the ammeter instead of the alternator end. (As Bob says above)

 

The wiring is shown in this link but of course it is for a dynamo, so the battery and ammeter polarity will be the other way round for you and there will be no dynamo regulator :

http://www.advanceautowire.com/tr24a.pdf

 

This thumbnail shows what yours probably should be like:

 

post-7865-0-13562200-1532523074_thumb.jpg

Edited by RobH

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Many thanks Bob & Rob. My big bro is the wiring expert, so I'll have a chat with him and get to the bottom of this!

 

Best wishes Willie

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Have a look at Section J4 of the Technicalities CD, and also the article which James Christie and I wrote for TR Action 248 (March 2011).

Ian Cornish

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