red top is starting and its designed to push out big power in short bursts
yellow top is deep cycle and its used for high current over a long period of time.
ive used a yellow top in my sq truck for iasca world finals and it was perfectly fine for starting. either way, you are pulling more power than you can supply, hence the dimming. what amp(s) do you have? ill be able to tell you how much power your pulling and tell you how to fix the problem.
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