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02-28-2024, 11:50 AM
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#1 |
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Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,764
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Alternator decoding
I’m thinking this is the original alternative for my 1968 part number 1100794 = 37a date code 7L8 I’m thinking that stands for 1967 December 8th am I off base ? I’m putting new bearings in it regardless it was charging but howling. I took it off the 68 stepside
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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02-28-2024, 12:20 PM
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#2 |
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Roadtrip!
 
Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,801
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Re: Alternator decoding
Yes, it appears correct for your truck. 1968 307, 327 or 396 37amp.
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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02-28-2024, 12:38 PM
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#3 | |
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Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,764
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Re: Alternator decoding
Quote:
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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02-28-2024, 01:11 PM
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#4 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,229
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Re: Alternator decoding
Test your diodes while you have it apart. A bad diode will cause a noise similar to a brg.
The alt will still charge with an open diode but will have much lower output. George |
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02-28-2024, 01:37 PM
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#5 | |
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Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,764
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Re: Alternator decoding
Quote:
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Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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02-28-2024, 03:36 PM
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#6 |
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Registered User
Join Date: Jul 2008
Location: Eastern Oregon
Posts: 2,394
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Re: Alternator decoding
I have a noisy one also. Can you elaborate a bit on the complexity of swapping out the bearings. Mine charges great but it is in need of new bearings for sure…thanks !
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71 C-20 07 Magnum RT AWD |
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02-28-2024, 04:10 PM
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#7 | |
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Roadtrip!
Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,801
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Re: Alternator decoding
Quote:
__________________
67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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02-28-2024, 04:26 PM
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#8 | |
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Registered User
Join Date: Jul 2018
Location: Catskill Mountains,NY
Posts: 8,764
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Re: Alternator decoding
Quote:
__________________
Mark 72 c20 custom camper Husky edition, 66 SS396 Chevelle 1964 Hawk, 63 Avanti,62 lark 1969 AMX , 1968 c20 stepside ,85 K20 1977 Suburban sold 68 anniversary. |
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02-28-2024, 10:14 PM
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#9 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,229
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Re: Alternator decoding
Nice work.
George |
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