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Old 03-15-2021, 05:22 PM   #7
hatzie
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Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,922
Re: Alternator-Starter-Junction Block Wiring 84 K30

The Civilian trucks usually have three connections on the starter BAT stud, and sometimes four.
Stock
  1. 4ga battery + cable.
  2. 12ga Power feed to the junction studs through a fusible link.
  3. 14ga Power for the headlamp switch through a fusible link.
  4. 14ga Sense to the Alternator through a fusible link.

The Civilian Junction studs usually have the following three or four connections stock.
  1. 12ga Circuit 2 Feed to the cab through a fusible link.
  2. 12ga alternator BAT stud main charge wire through a fusible link.
  3. 14ga AC blower HI through a fusible link.
  4. Sometimes trailer connector 12ga battery wire through a fusible link or a 50A circuit breaker.

Bumping up one wire gauge doesn't hurt a thing.

The CUCV has a 24v/12v hybrid electrical system and the OP is trying to morph it into a regular 12v rig.
__________________
1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8


RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.

Last edited by hatzie; 03-16-2021 at 11:29 AM.
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