# Gen car auxiliary battery dead **URL:** \ **Category:** GEM Forum\ **Created:** [March 3, 2025, 4:14pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940 "2025-03-03T16:14:22Z")\ **Posts on this page:** 15\ **Page:** 2
**Author:** ![gofast67](https://avatars.discourse-cdn.com/v4/letter/g/977dab/32.png) [@gofast67](https://community.electricforum.com/u/gofast67)\ **Post date:** [March 6, 2025, 8:39pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/21 "2025-03-06T20:39:37Z")
Relay is clicking properly. So am I just dealing with a bad inverter? Also gem car wants 599 for there. How can I install an after market unit for this? ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 6, 2025, 11:01pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/22 "2025-03-06T23:01:16Z")
I would test converter first. Often loose connection. Any dc-dc will work if rated as battery charger. 13.6v + ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 6, 2025, 11:02pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/23 "2025-03-06T23:02:01Z")
Gabe may stock them. ---
**Author:** ![gofast67](https://avatars.discourse-cdn.com/v4/letter/g/977dab/32.png) [@gofast67](https://community.electricforum.com/u/gofast67)\ **Post date:** [March 7, 2025, 2:27am UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/24 "2025-03-07T02:27:59Z")
It definitely isn’t working. Voltage drops when key is turned on. Relay is good. I tightened up all the contacts going into it,still no change. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 7, 2025, 11:43am UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/25 "2025-03-07T11:43:10Z")
Is it 4 wire or 5 wire model. A similar plug and play unit is available, but is often backorder. ---
**Author:** ![Cformony](https://avatars.discourse-cdn.com/v4/letter/c/b19c9b/32.png) [@Cformony](https://community.electricforum.com/u/Cformony)\ **Post date:** [March 7, 2025, 4:11pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/26 "2025-03-07T16:11:58Z")
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**Author:** ![gofast67](https://avatars.discourse-cdn.com/v4/letter/g/977dab/32.png) [@gofast67](https://community.electricforum.com/u/gofast67)\ **Post date:** [March 7, 2025, 4:35pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/27 "2025-03-07T16:35:00Z")
The current harness has 4 wire ---
**Author:** ![gofast67](https://avatars.discourse-cdn.com/v4/letter/g/977dab/32.png) [@gofast67](https://community.electricforum.com/u/gofast67)\ **Post date:** [March 7, 2025, 4:35pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/28 "2025-03-07T16:35:39Z")
Awesome thank you for this info ---
**Author:** ![AssyRequired](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/assyrequired/32/7621_2.png) [@AssyRequired](https://community.electricforum.com/u/AssyRequired)\ **Post date:** [March 7, 2025, 5:51pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/29 "2025-03-07T17:51:53Z")
@Cformony - Thanks for the example, But it might be worth noting that the output (being quoted at 12v) may not be enough to actually charge a battery. @gofast67 - Did you check your existing unit to make sure it is truly dead? True diagnostics should really go beyond feeling for a click. Is it getting 48v on the input? If yes, does it have 12v on the output? ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 7, 2025, 5:53pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/30 "2025-03-07T17:53:16Z")
That one is 12v. Won’t work. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 7, 2025, 5:54pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/31 "2025-03-07T17:54:47Z")
A 5 wire will also work. I believe the 4 wire were recalled. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [March 7, 2025, 6:16pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/32 "2025-03-07T18:16:32Z")
![image](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/3X/0/9/096a43080024e128de03aed4c6c275a53e03d824.png) ![image](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/3X/1/f/1fa39935334e889df69e96ca908033a85997528a.png) I can order these for about $250. May be one that Gabe stocks. I’m not in the business of selling parts. Price includes my mark-up. If cost is an issue, I can look for an on-line wholesaler for you. You can also send me yours to test first. ps. 13.7v may not be ideal, but should keep a sla battery charged. ---
**Author:** ![gofast67](https://avatars.discourse-cdn.com/v4/letter/g/977dab/32.png) [@gofast67](https://community.electricforum.com/u/gofast67)\ **Post date:** [March 7, 2025, 7:24pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/33 "2025-03-07T19:24:23Z")
I have pack voltage comin,and nothing going out. Only voltage on the 12 volt side,is the actual auxiliary battery reading after it has been charged back up. This battis new,and 1 month old. ---
**Author:** ![Cformony](https://avatars.discourse-cdn.com/v4/letter/c/b19c9b/32.png) [@Cformony](https://community.electricforum.com/u/Cformony)\ **Post date:** [March 7, 2025, 7:43pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/34 "2025-03-07T19:43:47Z")
I’m sure Amazon has others… that’s just the first one I came to … 25 dollars vs 600 dollars, it’s worth a look. ---
**Author:** ![gofast67](https://avatars.discourse-cdn.com/v4/letter/g/977dab/32.png) [@gofast67](https://community.electricforum.com/u/gofast67)\ **Post date:** [March 7, 2025, 8:35pm UTC](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940/35 "2025-03-07T20:35:09Z")
Absolutely, I will definitely look around [Previous page](https://community.electricforum.com/t/gen-car-auxiliary-battery-dead/28940.md?page=1)