Size engine and body ground straps for proper current return path based on circuit loads and resistance requirements.
Input Parameters
Results
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Min Cross-Section
mm²
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Strap Resistance
mohms
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Voltage Drop
mV
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Recommended Size
Note: Poor grounds cause mysterious electrical issues. Engine-to-chassis ground carries all alternator return current. Clean contact surfaces to bare metal and use star washers.
Reference
Min CSA = ρ × L / R_max (mm²)
ρ_copper = 0.0172 Ω·mm²/m
Strap R = (ρ × L / CSA) + R_contact
Voltage Drop = I_total × R_strap
Contact R: Braided=0.5mΩ, Bar=0.3mΩ