Electrical Issues - Please help!

[kbronco]

OK let me lay out what my problem is.

Every time I turn the ignition to the start position it blows the 15 amp fuse in my fusible link before my starter relay/solenoid.

What I've replaced recently as well as what I've replaced trying to solve this problem:

Alternator (stock)
Voltage regulator
Starter relay/solenoid
Ignition switch
Battery and associated cables
Starter cable

Let me know what y'all think.

 

[Viperwolf1]

Describe where this fuse is exactly.

 

[kbronco]

Describe where this fuse is exactly.

I have replaced the original inline fusible link that comes to the battery side if the starter relay/solenoid with an aftermarket 12 ga fuse holder/fusible link and a 15 amp fuse. On the 1970 wiring schematic the fusible link is marked 38a, its a black wire.

 

[Viperwolf1]

15 amps is not enough. That circuit powers everything and passes all the charging current from the alternator. Replace the fuse with the correct 16 ga fusible link.

 

[RRRAAAYYY2]

Or a larger properly sized fuse. Not a big fan of fusable links.

 

[kbronco]

OK, how many amps fuse then? I was just following a previous recommendation. Thanks. Happy Easter.

 

[oleguy74]

you will need a at least 40amp.

 

[Viperwolf1]

OK, how many amps fuse then? I was just following a previous recommendation. Thanks. Happy Easter.

About 60-70 amps is the most current you want going through that wire.

 

[kbronco]

Thanks a lot gents I'll give that a try.

 

[kbronco]

Installed a 40 amp fuse and it hasn't blown yet. Looks like that may have been my problem. Thanks for the help and I'll let you know if it keeps performing.

 

[Viperwolf1]

Carry spares. If you run the battery down low the alternator will blow the fuse when it charges hard.

 

[kbronco]

Thanks for the tip. I'll stick the rest of them in the glovebox.

 

[RRRAAAYYY2]

Carry spares. If you run the battery down low the alternator will blow the fuse when it charges hard.

Very good point, and when this happens you will damage the alternator. Though it is not the way it is wired stock, you should have a wire going directly from the alternator's output post to the positive on the battery. On a stock alternator, you can do this with a 10ga wire and be overkill.