Can i connect a Uniden UH089NB UHF 2way radio to 12 & 24v

Connect the two extra 12 volt batteries in series to get 24 volts. Then connect this new 24 volt supply in parallel to existing 24 volt battery supply.

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.

Check your electrical connections and your antenna set up first. Then if you still have a problem, check your mic/mic plug. Lastly, check your programming. If you have ignition sense programmed into the radio you will need to wire it accordingly, so it will sense the ignition of the vehicle.

Best regards.

They may not be compatible. Quite frequently, they use different numbers for the same channels, you may just have to experiment.

no sir it can not

Fused 12 volt power wire from the battery connects to +12V at the amp. Chassis ground wire connects to gnd at the amp. Switched 12 volt power wire (accessory) (remote turn on from after market radio) connects to rmt at the amp.

Hi,my name is John. The other red wire is positive also, and the black is the negative or ground wire......hope this was helpful....Rate this on the four thumbs-up.....John

I believe the Mag 36 is a 12v and the Mag 40 is a 24v......Ive been doin a little research and cant find anything that points to a 12 and 24v system.....

i have just printed off a hard copy of this manual it was on Http//.www.uniden.com.au/ RESOUCES main/pdf/uh011.pdf If that isnt helpfull i could post it out to you.