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add solenoid to isolate power to starter, or not
https://slantsix.org/forum/viewtopic.php?t=63108		 Page 1 of 1
Author:  DadTruck [ Fri Dec 21, 2018 3:51 pm ]
Post subject:  add solenoid to isolate power to starter, or not
I will be rewiring the 68 Barracuda over the winter months.
I currently have the battery relocated to the rear, and there is a disconnect
switch installed that will shut down the motor when the switch is opened.
The disconnect is wired similar to the first diagram, with one of the alternator field
wires connected to the disconnect post.

That system works, but the main power cable from the disconnect up to the starter post
is always hot while the disconnect is closed.
I do have fuses after that.

I have been considering installing a Ford Solenoid, similar to the second diagram.
That system has power to the starter only when the starter is engaged.

Adds complexity, but seems like a better way, but on the other hand I do have a disconnect
in the system.

any thoughts on this ?

Attachments:
File comment: current disconnect wiring
disconnect wiring to kill motor and alternator.jpg
disconnect wiring to kill motor and alternator.jpg [ 28.9 KiB | Viewed 6480 times ]
File comment: diagram with solenoid
Wiringmods_zps19df8022.1.jpg
Wiringmods_zps19df8022.1.jpg [ 58.79 KiB | Viewed 6480 times ]
Author:  emsvitil [ Fri Dec 21, 2018 5:33 pm ]
Post subject:  Re: add solenoid to isolate power to starter, or not
The second diagram is a bit too small (even after clicking on it) and I can't see what's going on with it.


Anyway, with a rear battery I'd feel a lot better with a ford-style solenoid next to the battery for the large cable running to the starter............
Author:  matv91 [ Fri Dec 21, 2018 6:35 pm ]
Post subject:  Re: add solenoid to isolate power to starter, or not
Could not see second diagram . A long big not fused wire could be a safety risk. Put that ford solenoid back at battery for starter wire only. Separate wire fused at battery for ignition, alternator etc. Or if one wire system from battery is needed, find a large max fuse,200 amp? for use at battery. The longer the wire the
more chance for shorts.
Author:  DadTruck [ Sat Dec 22, 2018 12:01 pm ]
Post subject:  Re: add solenoid to isolate power to starter, or not
I had to reduce the size of the diagram to get it to upload here at .org

I have copied it to Flicker and you should be able to see a full size copy at

https://www.flickr.com/photos/13718356@ ... datetaken/

This is not one that I originated, I copied it from a posting at FABO.
This one makes more sense than most that I have found, but I don't think that
it will shut off a running motor by opening the disconnect,
I contacted the person that drew the diagram and he said that the car will not start
with the disconnect open, but he has not tried shutting down the motor by opening the disconnect.
Author:  emsvitil [ Sat Dec 22, 2018 9:46 pm ]
Post subject:  Re: add solenoid to isolate power to starter, or not
It looks like once the engine is running, it will stay running even with the battery disconnected.

Alternator output would need it's own separate connection to the battery (with separate disconnect)
Author:  Charrlie_S [ Sun Dec 23, 2018 3:30 am ]
Post subject:  Re: add solenoid to isolate power to starter, or not
Quote:
It looks like once the engine is running, it will stay running even with the battery disconnected.
Correct
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