The Ford Barn - View Single Post

hardtimes · 07-27-2021, 02:07 AM

[QUOTE=Youngblood;2039071]Hi; I have a 1930, 6 volt positive ground. If I leave the fuse in after shutting off the car, I am experiencing about .2 volt drop in voltage at the battery over about 6 hours. Is that normal?
If not;
Do I need to just start disconnecting wires from the horn, lights etc. to find the drain?

Or, can I check various wires with a clamp amp meter to determine the drain or will all of the wires show an amperage reading if there is a drain?

Thanks for your help.

Mike[/QUOTE

Hey Mike ,
A lot of thoughts/ talk as to where and why parasitic draw may exist.
This ‘drain’ can be eliminated….as a problem… by installing a master cut off switch in your old car. Simple.
My old cars have sat unused for months with no problem. A clean charged battery can sit without sulfating for long periods of time.
Conversely, a dirty new battery put out of service can / will eventually discharge… from electrolysis across it’s top… post to post.
So CLEAN top of battery occasionally and install cut off switch, to resolve any such concerns.

07-27-2021, 02:07 AM	#20
hardtimes Senior Member Join Date: May 2010 Location: South California Posts: 6,188	Re: Parasitic Drain? [QUOTE=Youngblood;2039071]Hi; I have a 1930, 6 volt positive ground. If I leave the fuse in after shutting off the car, I am experiencing about .2 volt drop in voltage at the battery over about 6 hours. Is that normal? If not; Do I need to just start disconnecting wires from the horn, lights etc. to find the drain? Or, can I check various wires with a clamp amp meter to determine the drain or will all of the wires show an amperage reading if there is a drain? Thanks for your help. Mike[/QUOTE Hey Mike , A lot of thoughts/ talk as to where and why parasitic draw may exist. This ‘drain’ can be eliminated….as a problem… by installing a master cut off switch in your old car. Simple. My old cars have sat unused for months with no problem. A clean charged battery can sit without sulfating for long periods of time. Conversely, a dirty new battery put out of service can / will eventually discharge… from electrolysis across it’s top… post to post. So CLEAN top of battery occasionally and install cut off switch, to resolve any such concerns.