[DeTomaso] Alternator swap, alternator indicator is on

[Thomas Törnblom]

It was indeed the DRL circuit that caused the problem.

I’ve now added a transistor that reduces the current draw so the lamp goes out as it should when the engine is running. 

Cheers,
Thomas

> 18 jan. 2019 kl. 09:41 skrev Thomas Törnblom <thomas at hax.se>:
> 
> I think I know what the problem is.
> 
> I have a relay for my DRL where the coil is powered from the I lead and I suspect that the Ford alternator doesn't source enough power on the I lead to bring it to +12V, which would properly extinguish the alternator light.
> 
> I will disconnect the relay and verify that this is the issue, and if so, I will either need to add a transistor to reduce the current draw on this signal, or power the relay from the stator wire, but that only provides about 6-7V, so may have to use a different relay.
> 
> Cheers,
> Thomas
> 
>> Den 2019-01-17 kl. 20:22, skrev Thomas Tornblom:
>> I've replaced the Bosch alternator in my GT5 with a 130A Ford style alternator from DB Electrical.
>> 
>> I just started it up to check that everything works, and while it charges, the alternator light doesn't go out, it just gets a bit dimmer.
>> 
>> Measuring the voltage on the wire to the light I see that it is around 7V, which is about half of what the alternator outputs.
>> 
>> The stator wire should be around this voltage when the engine is running but I'm surprised that the indicator/ignition wire is at that voltage too. That seems wrong.
>> 
>> I know that there are owners who have replaced their old alternators with this type of alternator, how have you solved this issue? Skipped the light completely or did you not have this problem?
>> 
>> I'm contemplating adding a suitable zener diode in series with the wire, but it will take some testing to make sure that the current to the alternator then is enough to excite the field.
>> 
>> I'm also using this wire to engage the DRL:s, so hard wiring it to switched 12V will kill that functionality too.
>> 
>> Cheers,
>> Thomas
>> 
> 
> -- 
> Real life:   Thomas Törnblom             Email:    thomas at hax.se
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