I did a search and all I seam to find was about battery tenders.
the new to me 2005 SR3 1500cc has a single battery. I need to replace the battery the car has been sitting on the tender for a few months from the time I bought it but the battery goes flat very quickly after I unplug the tender.
has anyone done the dual battery conversion ? is there a parts list of what's needed ? would I need to totally remove and replace the complete charging system to charge both batteries?
Hi David (@rush-rentals), There are a couple of way to do this. The way the factory does the 24 V system is that they add a second battery in the side pod and that is just used for starting the engine. The car uses the rear battery to run the 12 V system in the car like the dash, etc.. The rear battery is charged by the engine electrical system. The battery in the side pod uses a stand alone charger that is powered by the 12V system to for charging.
I have seen some people modify 12V (single battery) cars by adding a second battery in the side pod, or sometimes they put it in the passenger foot well. For charging the second battery sometimes people use the Radical sourced charger and sometimes they just add a charging port to use a standard battery charger after the days racing is done. The starter battery tends to have enough charge to do a weekends worth of starts without charging.
Here is a picture showing a simplified wiring diagram showing the single battery installation.
See the nest post for more information.
Here is a simplified wiring diagram showing the additional battery installation excluding the charging harness. This would be the simplest installation, but you need to also add a charging port to charge the second battery because it will not get charged by the engine charging system.
See Next post for more information
Here is a simplified wiring diagram showing the additional battery installation excluding the charging harness. This would be the simplest installation, but you need to also add a charging port to charge the second battery because it will not get charged by the engine charging system.
See Next post for more information
Here is a simplified wiring diagram showing the charger system installation
See Next post for more information
Here is a picture of the On-board Charger that Radical uses (The silver box).
Here is a picture of the sidepod battery installation in an SR3 RS (Gen 2 car).
a friend from the radical page on FB said he did a 2nd battery and does the charging of it after his weekend at the track. my worry with that is not being a deep cycle battery from running them down and then recharging will it last as long as being charged from the cars charging system?
I do like that option as it seams like an easy solution .
I did my own. I used an Odyssey extreme battery and put it in the passenger footwell. I made a foot bar to protect it so anyone in the passenger seat can’t kick it. I put it in this location because it is far easier to get to it for maintenance etc…
I used the attached diagram and then added a contactor to run the positive cable from the second battery through and on to the starter and had it controlled by the safety switch so that if someone throws the safety switch, it truly kills power to everything.
i ran a charger line out to the passenger side air inlet same as the main battery hookup on the driver side. It rarely needs charging, but is simple and easy to get to and hookup.
I had a lot of charging issues early on until I bought an AGM charger and used it instead of battery tenders.
@jking85 and Charley this info is fantastic thank you so much
