Blazer1987
New member
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- Location
- Centerville,MA
Hi everyone.. I'm new to this site and I'm not sure if I am posting this in the right place. I recently purchased a m939a2 from government liquidation. I am so happy to finally own one of these trucks. I am having a problem with it starting intermittent. The battery switch and the control box is acting up I think. I put new batteries in the truck and when I was hooking them up I put wire#569 on the 12 volt side of the system like it says to do and the truck won't start. The ignition won't come on, none of the gauges work or anything. If I hook up wire 569 to the 24 volt side of the battery everything works fine? I don't get it. I have wiring diagrams and the manual for the truck and I can't figure it out it's driving me nuts. I know that wire 569 is supposed to be for the heater motor low speed. But it must also have something to do with. The ignition too. The control box looks replaced and new. I would just leave the wire hooked up to 24v but I don't want to fry anything. Any ideas?