Tech Tip – Preventing Dead Batteries

My ’54 TF developed a condition that would result in a dead battery after being parked for more than a month. Normal trouble shooting tests revealed a constant current drain of about .2 amps. The problem was traced to the horns. It seems that rain water had entered them and built up a conductive layer of corrosion near the ‘hot’ wire connections that caused a leak to ground. A good cleaning and drying cured the problem. I decided to go a step further and prevent a return of the condition.

As wired originally, a hot wire carries current to the horns and another wire runs to the horn button near the driver. This button blows the horn by complet­ing the circuit to ground. I changed this and now have one terminal of the horns grounded. The other terminal of the horns is still connected to the wire that goes to a ‘hot’ terminal on the ignition switch. The result? Horn opera­tion normal and no possibility of future corrosion causing a dead battery.

John G. Nauman Merritt Island, FL

Our thanks and a $10.00 Gift Certificate go to John.



Tagged: ,

'Tech Tip – Preventing Dead Batteries' has no comments

Be the first to comment this post!

Would you like to share your thoughts?

Please note: technical questions about the above article may go unanswered. Questions related to Moss parts should be emailed to

Your email address will not be published.

© Copyright 2022 Moss Motors, Ltd. All Rights Reserved.