Series/parallel for jump start

1. #1lantraxco2021-03-12 18:44

   Yep! Just want to connect your truck up to only one set of the 12V so it never gets 24

2. #2Midnightmoon2021-03-13 06:18

   I set up two batteries separate from the truck batteries with a golf cart solenoid to allow for 12 or 24 volt jump starts along with a quick connect jumper cable setup. The truck while running charged them.

3. #3Midnightmoon2021-03-13 07:05

   It's been a while since I had this setup I used a series parralel switch. I cant wrap my head around how you could make it work without a switch and maintain the batteries equally. 24volt jumper in place of starter

4. #4Old Doug2021-03-13 07:19

   If i had a very new truck i would not do this. If i was needing to do this alot i would get 2 spare bats to haul around if you hauled a welder or had a coverter to charge them.

5. #5Midnightmoon2021-03-13 07:55

   They ran series parralel switches on trucks with 24 volt starters for a long time. If switch goes bad you just dont have 24volt output. The switch is the only way I would do it

6. #61466IH2021-03-13 22:22

   Another vote for the series parallel switch. I have this one but been waiting on some free time to get it installed. http://www.texasindustrialelectric.com/relays_1119845.asp

7. #7funwithfuel2021-03-13 23:10

   That looks exactly like what Kenworth used to use on their old 24/12 systems. I believe I've seen it an an old IH loadstar or transtar with a super 290 as well. That old girl still had the compression relief under the dash.

8. #8Tugger22021-03-13 23:19

   My electrical repair guy knows these S/P switches well but says its hard to get parts to repair them.

9. #9lantraxco2021-03-14 00:36

   They're a hundred bucks, and with what little use one would get in a setup like this, keep it dry it will probably outlive you.

10. #10Midnightmoon2021-03-14 06:35

    I used one for over 5 years in frigid temps all the time jumping loaders for snow removal it never failed me. 100 bucks is well worth it.

11. #1189226592021-04-12 08:01

    What I ended up doing is just add 2 batteries 1000 amp each in steal box wired in series / parallel switch just like 70s Kenworth so battery’s charge off truck alt quick connector for jump start cables so I can use same cables for 12 volt off truck batteries a switch in box panel to control s/p switch .