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Old 04-20-2017, 07:41 AM
rapid_ascent rapid_ascent is offline
 
Join Date: Mar 2008
Location: Dublin, CA
Posts: 821
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#10 wire with a 20 amp current would have a 20mV (0.02 Volt) voltage drop per foot. So a 3 volt drop would be a 150 foot wire. Sounds like the wire size isn't the problem.

Check the voltage drop across the relay contacts. You might also want to check your battery output voltage directly on the battery when it is under load during starter operation.
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