The final connection should land on a designated ground point away from the battery, because a discharged battery vents flammable gas.
The Last Jumper Clamp Does Not Belong on the Dead Battery Read Post »
Hunting a battery drain requires letting the vehicle fall asleep first, then measuring methodically rather than yanking fuses and hoping.
A Parasitic Draw Is Not Found by Pulling Fuses at Random Read Post »
Modern charging systems deliberately move the target voltage with temperature, load and driving conditions, so a single meter reading proves very little.
A Voltage Regulator Does Not Hold One Fixed Charging Voltage Read Post »
The number stamped on an alternator is a peak capability under test conditions, not the charging current your battery actually receives.
An Alternator’s Rated Output Is Not What Reaches the Battery Read Post »
Every zone valve, damper motor and smart thermostat draws from the same small transformer, and the total is easy to exceed.
Adding Accessories to a Control Transformer Has a VA Limit Read Post »
Letters on the terminals describe function within a low-voltage loop, and several of them mean different things across manufacturers.
Common on a Thermostat Terminal Block Does Not Mean Ground Read Post »
The valve and the switch that proves it opened are two separate functions, and one can work perfectly while the other quietly fails.
A Zone Valve That Opens Still Needs Its End Switch to Make Heat Read Post »
These units exchange heat between airstreams while bringing in outdoor air, but they do not condition it the way equipment does.
An ERV Is Not a Dehumidifier and Will Not Cool Your House Read Post »
Water introduced into ductwork with no air moving collects where it should not, which is why the control chain includes an airflow proof.
A Whole-House Humidifier Should Not Run Without the Blower Read Post »
These fans move enormous volumes of air out of the living space, and without open windows the replacement air comes from wherever it can.
A Whole-House Fan With the Windows Shut Can Backdraft a Flue Read Post »
