[DeTomaso] Alternator swap, alternator indicator is on
thomas at hax.se
Fri Jan 18 03:41:53 EST 2019
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
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.
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.
Real life: Thomas Törnblom Email: thomas at hax.se
Snail mail: Banvallsvägen 14 Phone: +46 18 32 31 18
S - 754 40 Uppsala, Sweden Mobile: +46 76 209 8320
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