Voltage Fluctuation Problem
August 29th, 2018, 7:58 PM
#1
CF Beginner
Thread Starter
Join Date: Aug 2018
Posts: 15
Likes: 0
Received 0 Likes
on
0 Posts
Voltage Fluctuation Problem
2004 Silverado. Voltage fluctuates from 14 down to 10v, only when it is raining out. Speed doesn't matter. 25mph or 70mph it still does it. Needle does not pulse with the wipers. New battery and alternator. Ground from battery to frame has been cleaned. Battery cables are good. Any ideas?
August 30th, 2018, 4:48 PM
#3
CF Beginner
Thread Starter
Join Date: Aug 2018
Posts: 15
Likes: 0
Received 0 Likes
on
0 Posts
Couple weeks ago it dropped and a warning came up on the message center, battery not charging. Replaced battery and alternator. Only happens when driving and only when it's raining. All speeds. Have only been watching the volt gauge in the cluster.
August 30th, 2018, 5:43 PM
#4
CF Senior Member
Ok, but you haven't been left with dead battery? gauge clusters do get issues,but moisture related?start following leads off of battery,give a close inspection,a intermittent short to ground,? a circuit that is on during problem,head
August 30th, 2018, 5:57 PM
#6
CF Beginner
Thread Starter
Join Date: Aug 2018
Posts: 15
Likes: 0
Received 0 Likes
on
0 Posts
While it was happening the last time I did shut off fog lights, headlights, ac, driving lights all separately and all at the same time...no change. Turning off the wipers made no difference also. Sanded down ground from the battery to the front bumper, sanded and cleaned area at the bumper also. Next is finding a schematic and checking all the grounds.
August 30th, 2018, 6:01 PM
#7
CF Senior Member
Right on,that one is small ground wire off battery to radiator support?then passenger head to firewall,harness to frame under drivers side door, harness to box mount at fuel filler door
Trending Topics
September 1st, 2018, 10:40 AM
#9
CF Senior Member
How is your belt?
I'd say alternator, but you have already replaced that. With it only happening in the rain, I wonder if you might be getting some belt slippage?
I'd say alternator, but you have already replaced that. With it only happening in the rain, I wonder if you might be getting some belt slippage?
September 17th, 2018, 6:11 PM
#10
CF Beginner
Thread Starter
Join Date: Aug 2018
Posts: 15
Likes: 0
Received 0 Likes
on
0 Posts
Okay now I'm really getting frustrated. Truck sat out all day in the 90 degree heat, direct sunlight. Got out of work, started the truck....10volts at the gauge. 20 min drive home mostly highway, no accessories on and by the time I got home....9.5volts. Opened the hood checked battery connections, grounds, starter connection...all looks fine. Let the truck sit for an hour. Went back outside, started it up and 14.5 volts right away. What would the heat effect? When the engine gets up to operating temp the volts drop to about 12.5. I can shut the truck off, count to 30, turn truck back on and boom...14.5 volts. Any ideas?
