Have Ford Questions? Ask a Mechanic for Answers ASAP
Hi my name is***** will be glad to help. Test the batteries with a digital tester for the internal condition such as for bad cells, internal shorts, low CCA, etc and also check the cables and connections that they are clean and tight and free from damage or corrosion. Check for voltage drops in the starting and charging system and do a battery drain test to isolate the circuit that is drawing the most voltage.
Click this link for how to perform this test on any automotive application
Parasitic drain test
No. Two different circuits.
If that were true in DC voltage you would never be able to separate any of your lighting circuits as they would bypass and drain from one another though the ground side. Please tale a moment to rate my service a that is how the site credits my time helping on the site. 5 star and bonuses are greatly appreciated and we can follow up as needed.
Pleasure to help. Convince him with OHMS law of electrical.
Here is some FYI to share with him. DC only flows one way or you have a short.
Some older trucks from long ago ran positive ground circuits but is obsolete in todays standards and caused too many problems. If you tried to wire a Negative ground circuit to that vehicle you would have an instant short. Both cant exist together. Pleasure to help and let me know if I can be of more assistance.
Ok great. Its been a pleasure to help. Enjoy the rest of your weekend.