Mystery Battery Draw While Parked UPDATE
Update 13 Jan--
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Never know--somebody on here might have an idea what to look for, thanks for any help.
2003 Chev 2500HD LT (so has lots of electrical stuff that works with ignition off) 6L gas.
Problem is the battery voltage goes down too fast while engine off parked overnight. Say 12.6 evening then 12.5 next morning then 12.4 next morning, etc.
In theory you can find a mystery draw by pulling fuses one at a time, but there are a kazillion fuses, so it would be helpful to know some likely suspects as nothing appears to be "on" when left overnight.
I took one cable off the battery inserted meter and confirmed there is a steady 0.74 amp draw. I don't know what is a normal amount but this seems high at 18AH a day.
I had the battery load tested and it was in excellent shape with a 400 amp draw and bounced right back. I charged it up and let it sit and it has no unusual self-discharge after a few days. So it is not the battery, it must be a mystery draw AFAIK.
I cannot relate when this started to anything that happened. Years past ISTR it would sit at about 12.5v for long periods while parked. It has been kept plugged in at home mostly with the camper on so the engine battery has been floating at 13.x volts, so I can't say when this all started. Notice it now with the camper off.
The battery dash light glows dimly with ignition off, but it has done that for 19 years. The dash shift indicator lamp is out, which is fairly new- can't see what gear you are in.
So what are some likely suspects that I could check by pulling their fuses or circuit breakers?
-----------
Never know--somebody on here might have an idea what to look for, thanks for any help.
2003 Chev 2500HD LT (so has lots of electrical stuff that works with ignition off) 6L gas.
Problem is the battery voltage goes down too fast while engine off parked overnight. Say 12.6 evening then 12.5 next morning then 12.4 next morning, etc.
In theory you can find a mystery draw by pulling fuses one at a time, but there are a kazillion fuses, so it would be helpful to know some likely suspects as nothing appears to be "on" when left overnight.
I took one cable off the battery inserted meter and confirmed there is a steady 0.74 amp draw. I don't know what is a normal amount but this seems high at 18AH a day.
I had the battery load tested and it was in excellent shape with a 400 amp draw and bounced right back. I charged it up and let it sit and it has no unusual self-discharge after a few days. So it is not the battery, it must be a mystery draw AFAIK.
I cannot relate when this started to anything that happened. Years past ISTR it would sit at about 12.5v for long periods while parked. It has been kept plugged in at home mostly with the camper on so the engine battery has been floating at 13.x volts, so I can't say when this all started. Notice it now with the camper off.
The battery dash light glows dimly with ignition off, but it has done that for 19 years. The dash shift indicator lamp is out, which is fairly new- can't see what gear you are in.
So what are some likely suspects that I could check by pulling their fuses or circuit breakers?
