Alternator low output...
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Posting Guru
Joined: Apr 2003
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From: Venezuela
Alternator low output...
Hi all ! My f150 1986 was upgrade 2 years ago with a new Delco Remy alternator 94Amp, 12V, internal regulator. After that my truck keeps 14Vdc all time, even with engine running at idle + AC + Lights + wipers and electrical fan. 
Some months ago it start lossing power I mean can´t hold 14 Vdc with same loads and idle as always did, I had replaced the voltage regulator, rotor, stator, brush and bearings and still same, the diode package was tested and all 6 diodes seems to me are working fine... but problem still present
Anyone know what's the problem??? should I replace diode package even if it is passing the standard test??? there is a black semiconductor also, triod I guess.. this is basically a package with 3 diodes inside, it works fine but could be causing problem???
Any advise will be appreciated... Thanks
Some months ago it start lossing power I mean can´t hold 14 Vdc with same loads and idle as always did, I had replaced the voltage regulator, rotor, stator, brush and bearings and still same, the diode package was tested and all 6 diodes seems to me are working fine... but problem still present
Anyone know what's the problem??? should I replace diode package even if it is passing the standard test??? there is a black semiconductor also, triod I guess.. this is basically a package with 3 diodes inside, it works fine but could be causing problem???
Any advise will be appreciated... Thanks
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Joined: Jan 2001
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From: Virginia
Check your idle speed to make sure it's high enough.
Of course check your belt. If it's been on there for two years, change it.
Inspect the alternator pulley. Make sure the groove has no wear.
What was your diode pack test? I assume you took a meter and got continuity in one direction, and not in the other for all 6 diodes?
Of course check your belt. If it's been on there for two years, change it.
Inspect the alternator pulley. Make sure the groove has no wear.
What was your diode pack test? I assume you took a meter and got continuity in one direction, and not in the other for all 6 diodes?
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Posting Guru
Joined: Apr 2003
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From: Venezuela
Ok, fallowing your recomendations, I did install this morning a new pulley and belt but things are same...
Idle speed is 650 as always and diodes were tested using same procedure you describe, anyway I guess I'm going to replace diode package and triod also, both are the only original parts, hope it works...
I'm planing also upgrade to a 130Amp - 12Vdc alternator like used by earlier Explorer
Any extra comments???
Thanks.
Idle speed is 650 as always and diodes were tested using same procedure you describe, anyway I guess I'm going to replace diode package and triod also, both are the only original parts, hope it works...
I'm planing also upgrade to a 130Amp - 12Vdc alternator like used by earlier Explorer
Any extra comments???
Thanks.
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