That would mean you have a 24v alternator, and a transformer built into the truck to run everything else on 12v. Point being, you would need to have your alternator rebuilt to put out more amps at 24v. Also, to get more amps out of your 12v system, you'd need to make sure that your transformer circuit is capable of serving up your amp draw.
Many of the HDJs run an oddball setup (OK, it seems oddball to me) where the batteries are in parallel but have a relay that connects them in series for the starter circuit only. I cannot wrap my simple mind around how the hail that works but apparently it does.
Many of the HDJs run an oddball setup (OK, it seems oddball to me) where the batteries are in parallel but have a relay that connects them in series for the starter circuit only. I cannot wrap my simple mind around how the hail that works but apparently it does.
12/24 v solenoid relay aka parallel/series relay - basic principal is that the relay closes when the start (ignition) circuit is engergized, and switches the battery posts from a parallel 12v configuratiion, to a 24v series configuration. When the the start wire goes cold again, the relay switches back to 12v parallel. Used on some larger industrial trucks and marine applications.
It's pretty cool IMO. The starter requires a certain amount of power (like any DC motor) in order to turn. P = V*I, so if you double the voltage you cut the amount of current required to start the vehicle by 50%.
