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Old 07-26-2022, 10:26 PM   #2
lwmcguir
Senior Member
 
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 1,158
THOR #9178
Start with checking battery cables from the chassis batteries to the solenoid

Be sure they are corrosion free and tight. Be sure the cables are in good condition.

Also watch the voltage

Did it drop when the grid heater engaged? (Glow plugs maybe for yours?

Did the voltage drop when the starter solenoid clicked?

You might want to load test the batteries while cleaning the terminals
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