Need help with altnater
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Senior User
Joined: May 2005
Posts: 179
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From: Boston
Need help with altnater
Alt starts discharging at 1800 RPM - brand new alternator. Old did the same. Belt is good, tensioner is good, idler pulley is good, belt is tight. Batteries are new. Brand new positive cable, grounds are good. At 1800 RPM regardless of load battery light comes on, lights dim, and volts drop to 12.1 on a volt meter. Please help
Postmaster
Joined: Aug 2004
Posts: 3,948
Likes: 2
From: SHELTON, WA
same thing was happening to me. but since you got a new one well maybe its still messed up take it back and try another.....if that doesnt work well hopefully the electrical gods will see this post. i such at electrical things. good luck
New User
Joined: Mar 2006
Posts: 17
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When does the alternator supposed to kick in
On the subject of Alternators:
After the engine starts it can take up to 1 Min. before the alternator starts charging, regardless of engine speed. Is this normal? If so Why? This the 2nd alternator I put in, both seem to have the same behaviour.
thanks
db
After the engine starts it can take up to 1 Min. before the alternator starts charging, regardless of engine speed. Is this normal? If so Why? This the 2nd alternator I put in, both seem to have the same behaviour.
thanks
db
Elder User
Joined: Jun 2005
Posts: 894
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From: Greater Floyd Area, AR
Originally Posted by bockusd
On the subject of Alternators:
After the engine starts it can take up to 1 Min. before the alternator starts charging, regardless of engine speed. Is this normal? If so Why? This the 2nd alternator I put in, both seem to have the same behaviour.
thanks
db
After the engine starts it can take up to 1 Min. before the alternator starts charging, regardless of engine speed. Is this normal? If so Why? This the 2nd alternator I put in, both seem to have the same behaviour.
thanks
db
jimbo
Postmaster
Joined: Aug 2004
Posts: 3,948
Likes: 2
From: SHELTON, WA
Originally Posted by bockusd
On the subject of Alternators:
After the engine starts it can take up to 1 Min. before the alternator starts charging, regardless of engine speed. Is this normal? If so Why? This the 2nd alternator I put in, both seem to have the same behaviour.
thanks
db
After the engine starts it can take up to 1 Min. before the alternator starts charging, regardless of engine speed. Is this normal? If so Why? This the 2nd alternator I put in, both seem to have the same behaviour.
thanks
db
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
the alternator doesn't charge for approxaimately 40 seconds after start up its controlled by the computer and it actually has nothing to do with glow plugs. the glow plug are on for various times depending on engine and air temps (anyhwhere from 0to 120 seconds)but the alt never charges until 40 seconds. not shorter not longer. so yes it is normal.
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