Kohler TP-6808 — Millivolt Drop Test Procedure
Testing & diagnosis · transfer switch main contacts
For the Kohler TP-6808, from the Kohler service manual.
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Before you start
- Only authorized personnel should open the enclosure.
Procedure
- Apply a balanced load of at least 10% of switch rating.
- Measure voltage on both sources from source lug to load lug.
- Take several readings to ensure accuracy.
- Use an ammeter to measure current flow through the circuit.
- Calculate contact resistance using R = V / I.
- Compare calculated resistance to maximum; replace contactor if too high.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- R = V ÷ I
- 100--200 Amp max contact resistance 0.250 milliohms
- 300/400 Amp max contact resistance 0.200 milliohms
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.