greenskeeper
Full Access Member
The current load of the GPs brings down the voltage some. 11V is not that low. They key is - check the voltage on each big terminal WHILE the GPs are running. If the DIFFERENCE between them is more than 0.3V, the relay needs replaced.
This.
Sounds like you've got the GPR system working properly and shouldn't have trouble starting a low temps. 5w-40 oil also helps tremendously.