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So, not too long ago, I installed an electric water temp gauge. It works nice, but something is bugging me, when I turn my flash lights, the needle bounces as the light flashes, if I turn the A/C, it reads lower than it should, if I turn my headlights the same thing happens.
I know I have an old car, but I haven´t really started digging to see what´s going on, I did measure my voltage and it was 14.5 with no accesories, and with everything on, it went to 13.5, and stayed there, all this at idle. The battery is brand new so, I ruled that out.
What I thought is that maybe I may have a ground problem, because, the sender ground is bolted to where my fuse box ground goes, and the indicator ground is bolted to my dash, should I ground both thing to the engine instead?
Tomorrow I will do a parasitic test just to check my electrical system to be sure that everything is fine.
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