[DeTomaso] Best suitable source for fan wiring upgrade?

[Paul Timko]

Remember the ammeter is meant so show the current charging the battery 
or the current being drained from the battery.  It doesn't show the 
amount of current the alternator is putting out or the total load current.

For issue 0, option 3 will show your fan current as battery charging 
current.

For issue 1, only option 3 will route any extra current through the 
ammeter assuming your alternator can provide for the total load.

For issue 2, this only matters for option 1 and can only be determined 
based on the wire from your alternator to the ammeter.  Though I suspect 
the wiring must be good as your can charge your battery with way more 
than 20 amps.

For issue 3, a fuse is usually a good thing.

Paul
#9270

On 3/18/2013 3:20 PM, steven.liebenow at att.net wrote:
> All,
>
>
> Working on upgrading my current draw for fans....and see a few different
> options.  Was throwing this out for feedback on the most sound method of doing
> this....
>
> Options
> 1) Extend a new wire from the back of the AMP gauge in the dash, out to the
> front fan area, and then feed relays.....normal thing.   #10 has been
> mentioned...
> 2) Run wire from battery terminal on starter relay up to front.....relays
> again....
> 3) Run wire from rear of alternator output or from regulator output up
> front....relay thing......
>
>
> I believe that I am going to be drawing about double what I had previously.
> Using an old Stewart Warner gauge...no idea how accurate, I measured a 6A draw
> on my old fans, and an 8-10 on the new fans.   Paperwork says that they are 25A
> fans (Derale)......each.    My amp meter only went up to 10A and I didn't feel
> like blowing fuses trying to figure out if they draw more than 10A......so let's
>
> just say that they do......for sake of discussion.....
>
> Issues:
> 0) It would be nice to have the gauge read actual draw.  I don't believe I would
>
> get that with options 2 & 3 above.
> 1) I am concerned about loading on the gauge.
> 2) I am concerned about loading on the wiring to the gauge.    I do not recall
> which relay etc feeds the gauge or if it comes directly from the ignition
> switch....need to spend time in the Italian schematics.....(this is on a Goose!)
> 3) I am concerned about running a hot lead up thru the chassis......but have 50A
>
> fuses available.....that I would put on the source end in the event of something
>
> bad happening that would pinch the wire.
>
> Just interested in hearing pro's and con's here.......
>
> Thanks!
> Steve
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