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are you getting any power --is fuel pump coming on //starter getting power etc -does the dash light up when key turn on to start --use a multi meter and test circuits power to fuse box and continue checking for problem -----
When you go pos to neg from one battery to the next it increases voltage, pos to pos just increases amperage. You would want to wire 2 in series, just imagine stacking batteries in a flash light, pos from one to neg on next. Remaining pos and neg are 12v now. Run both remaining pos to starter and ground both negs. your pushing a lot of amps with the batteries and doing 12v, and your charging system is 12v. If you do another series from there, you have to regulate the voltage when the starter kicks in...you risk burning every light and electric component...just like running 12v in 6v system... You can also use 4 12v batteries and run all pos to pos and all neg to neg and have mega cranking amps...that is how all modern big trucks are set up. Your pushing around 7k cranking amps that way(1500 per battery)...plenty to start the healthiest cat... And don't have the worry of dual voltages or running in series. You really don't need 24v to start and unless you have a 24v alternator, these are your 2 options. Best bet if your not sure is to try with 12v...no risk of frying anything even on 24v system. 24v on 12v system is, on the other hand, a big risk.
Alternator is not working correctly. You are getting less voltage out of it. The brushes are probably worn out on it. Have the alternator checked and replaced if defective.
first check fuses. check fuse 18(7.5a acc) in the under dash fuse/relay box. then check fuse 46(15a(typesh)10a), and fuse 43(7.5aclockradio) in the under hood fuse/relay box. if all fuses are good then you need to make sure you have 12v on the white/yellow wire(batt) and the white/red wire(ignition) on the blue connecotr on the back of the audio unit(the wht/red wire will only have 12v with the ignition in on or run.
check to see if 12v at alt power terminal then unplug three wire connector with key on should have 12v at green wire with red stripe 12v at black with orange (could also be grey with yellow)may be a white with black wire with 6v when running plugged in
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