rick martin
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alternators charging runs fine 24 volt 200 amp shut it down and leave it dead batteries in 24 hours
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1985 m1010 batteries die when parked help?
- Thread starter rick martin
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Where are you leaving the service light switch? That can cause a draw but not dead batteries in 24 hrs. You have something spilling over. Have your batteries been load tested? What are the voltages at each battery when they are dead? If you have a draw off the 12V side, just the front battery will be dead.
rick martin
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switch is on. they have been load tested both under year old checked out fine. rear spotlights don't work and front blackout light in grill is missing. wondering if that could be a problem?
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Were they load tested? Check the voltage at each battery when they are dead and report that back. Need more info to help you.
Gunnermac
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Check for bad diode in one or both alternators, they will charge as they should, but will kill the batteries, switch on or off.
papakb
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Go over to Sears and buy one of their inexpensive clamp on current meters. Measure the current draw from the batteries with the engine off and start disconnecting things until the current draw drops to 0. Once you know which channel is drawing the batteries down you should be able to figure out what's killing them.
You didn't mention how old your batteries are and that could be a factor too. Disconnect them and let them sit overnight and then do a specific gravity test on them. If they're still dead it's time for new batteries.
Kurt
KG6KMJ
You didn't mention how old your batteries are and that could be a factor too. Disconnect them and let them sit overnight and then do a specific gravity test on them. If they're still dead it's time for new batteries.
Kurt
KG6KMJ
tourus
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When I got my 1010 I found the same thing.. batteries would be dead in a few days. what I found was the electric magnet for the a/c unit on the engine for the box was staying on all the time. big draw. also found the black out light for the brake light was on fix the switch by the brake pedal fix the problem. you will keep looking for a constant draw with the key off. good luck. there is no clear cut one thing we can all say that is your big one thing fix. you are going to have to keep looking until you find it.
but things to check. all the black out lights make sure they are going off. a/c pump magnet. make sure there is nothings left on in the box. heater motor or fan motor. or could have a bad alternator or starter grounding out.
but things to check. all the black out lights make sure they are going off. a/c pump magnet. make sure there is nothings left on in the box. heater motor or fan motor. or could have a bad alternator or starter grounding out.
rick martin
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checked battery voltage this morning only front battery dead 1.2 volts rear battery12.1 volts so is it the 12 volt side drawing power?
rick martin
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I will check inside the box after battery is back in the truck thanks
41cl8m5
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If you leave the switch in service drive a relay is engaged that controls power to the spot light on the roof. The tm says to position the switch in the off position after you are done operating the vehicle for the day. It was easier to keep the procedure the same for the 1980's cucv to keep it simple. The rest of the cucv series is fine with leaving the switch in the service drive position, only the m1010 has the situation but the relay should take a few days to drain the batteries so the starter will not actuate.
I believe the idea was to shut down the spot light and the the two side service lights when the switch is in black out mode or off. Neat idea to use a relay to control the operation of power going to or not going to the switch that powers all normal lights and also the horn. It's a visual and sound control in night operations in the field when you are trying not to give away your position.
I believe the idea was to shut down the spot light and the the two side service lights when the switch is in black out mode or off. Neat idea to use a relay to control the operation of power going to or not going to the switch that powers all normal lights and also the horn. It's a visual and sound control in night operations in the field when you are trying not to give away your position.
rick martin
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thanks for the help so far all switches are off when I connect batteries the a/c clutch engages with key off does anyone know the location of the a/c relay I think that is stuck on thanks again
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The AC relay is under the driver side litter/stretcher box. There is a cover over a bunch of relays, it should be a white one. Mine did the same thing, I took the relay apart and replaced the diode.
rick martin
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thanks for the info I will look tomorrow
rick martin
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I would like to thank everyone for the help diagnosing my problem . it was the a/c relay. thanks again. I am sure I will have more questions about the truck in the future.