Alternator cable routing

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Johnny Atomic

Full Access Member
Joined
Oct 18, 2019
Posts
54
Reaction score
92
Location
Little Rock AR
First Name
Johnny
Truck Year
1983
Truck Model
Sierra Classic
Engine Size
305
I have questions about the large cable out of the alternator on the "bat" connector. I see on some trucks they have a large gauge cable from the bat connector to the battery positive. I have an 1983 305 w/ quadradjet. Mine has a cable from the bat connector to same lug on the starter as the large cable going to the battery. I don't think this is original to the truck. It runs down the front of the block and routed underneath the exhaust manifolds to the starter. This looks dangerous to me, I put some split loom around it to protect it from chafing but looks like it could be easily melted from the exhaust heat. I've read that some run this cable from the bat connector, down behind the valve cover, and down the rear of the block through a metal tube to the starter. The 1983 light truck shop manual is not very clear about what the bat terminal is connected to for the LE9, and the routing for that connection. From reading the manual it sounds like the connection from the bat connector goes to the bulkhead.

What was the "bat" connector originally connected to on the other end?? Which way was it routed? What are the advantages and disadvantages of the different methods? What cable would you use? What is the best way to rout it?
 

75gmck25

Full Access Member
Joined
Oct 13, 2016
Posts
1,992
Reaction score
1,766
Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
Original routing on my ‘75 was with the BAT wire in a plastic loom, clipped to the top of the valve cover, down the back of the engine through the metal tube, and with a fusible link where it connected to the starter lug. There is a 2nd power wire connected to the starter lug, and it runs up through the same metal tube and over to the junction next to the brake booster.
 

JT58

Junior Member
Joined
Aug 1, 2023
Posts
21
Reaction score
30
Location
Naples, FL
First Name
JT
Truck Year
1987
Truck Model
V10
Engine Size
5.7
Mine had the red cable to the starter previously running down to a clip on the front differential, the by the exhaust manifold to the starter. Bad spot with the differential moving up and down and too close to the exhaust manifold. I had a shop do some work and they noticed the issue and gave me a new cable and routed it down along the inside of the frame then over to the starter. Much better this way.
 

Forum statistics

Threads
41,430
Posts
894,295
Members
32,881
Latest member
Okie1118
Top