Battery drain, alternator problem?
#1
Battery drain, alternator problem?
I noticed slow starts which got worse until the battery died. Jumped it right up. Hooked up a battery tender. I have not done a parasitic draw test yet but got a voltage meter. I see that with everything on it is under 13v. Could this be a sign of the alternator going. I will check all the ground wiring since I see comments about it.
Idle, no accessories
Side markers only
Headlights on
Headlights and fog light
Headlights, fog lights, radio on
Headlights, fog lights, radio and AC fan on high
Headlights, fog lights, radio, AC fan high and AC compressor running.
Idle, no accessories
Side markers only
Headlights on
Headlights and fog light
Headlights, fog lights, radio on
Headlights, fog lights, radio and AC fan on high
Headlights, fog lights, radio, AC fan high and AC compressor running.
Last edited by JGuti; 02-25-2024 at 09:06 PM.
#2
Rennlist Member
Check your battery cables for any corrosion.
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JGuti (02-26-2024)
#3
Rennlist Member
Caveman opinion is those voltages look ok with those bus loads and at idle. Based on these idle voltages not an alternators issue.
How old is your battery?
How old is your battery?
Last edited by mike cap; 02-25-2024 at 11:47 PM.
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JGuti (02-26-2024)
#4
Check the readings when the car is fully warm vs at cold start. Its possible that voltage regulator works when cold but not when its hot. That would mean the vr is failing. Clean the contacts as well. The fan sucks in tons of dust and the connections don't stay clean after a while.
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JGuti (02-26-2024)
#5
RL Community Team
Rennlist Member
Rennlist Member
Hi J,
Before looking too deeply for an expensive solution check your alternator belt, that it is not too loose. In my experience, a failed alternator never archives the required voltage regardless of load.
Andy
Before looking too deeply for an expensive solution check your alternator belt, that it is not too loose. In my experience, a failed alternator never archives the required voltage regardless of load.
Andy
The following users liked this post:
JGuti (02-26-2024)