Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

Fusible Links

Thread Tools
 
Search this Thread
 
Old Aug 12, 2016 | 07:57 PM
  #1  
dragsta's Avatar
Thread Starter
Member
 
Joined: Aug 2012
Posts: 126
Likes: 0
From: florida
Car: 86 WS6 5sp TA
Engine: 305
Transmission: 5sp
Axle/Gears: posi
Fusible Links

i'm pretty sure now that my no-start issue is a blown fusible link. i shorted out the battery when installing it long ago. it cranks but no juice to the coil. which fusible link is the prime suspect and where is it located?
Reply
Old Aug 14, 2016 | 04:37 PM
  #2  
dragsta's Avatar
Thread Starter
Member
 
Joined: Aug 2012
Posts: 126
Likes: 0
From: florida
Car: 86 WS6 5sp TA
Engine: 305
Transmission: 5sp
Axle/Gears: posi
Re: Fusible Links

can anyone help me locate the fusible link that sends power to my ignition coil? where can i buy fusible links?
Reply
Old Aug 14, 2016 | 05:20 PM
  #3  
sofakingdom's Avatar
Supreme Member
20 Year Member
Community Builder
iTrader: (1)
 
Joined: Sep 2005
Posts: 27,876
Likes: 2,431
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Fusible Links

There is no fusible link that does that.

The fusible links protect the BIG RED wires of the car; that is, the ones that are the main battery feeds to LOTS of the things in it. Most of our cars have 2: about half of the total load of the car is fed through each. One might feed the headlight switch (and from there, the headlights, tail lights, dash lights, etc.) and the Courtesy light circuit; and the other the ign sw (which includes the starter solenoid, the ign coil, accessories like the blower motor & radio, gauges, and so on). Other loads like power seats, rear window defogger, etc. might be split up between them. I don't know the details for your specific vehicle but it works basically in that way in all cars.

They're at the starter, that being the most convenient place to hook "the car" up to the battery. Since the batt cable already has to go there, "the car" (fusible links) attach to the same post where the batt cable goes, which of course is electrically the same point as the batt itself.

If the car cranks, then batt is making it all the way to the ign sw, and from there, onwards toward the starter solenoid. The coil gets power from the ign sw as well. If one thing fed off the ign sw gets power, but something else doesn't, then the cause can't be the batt feed going TO the ign sw.

Your problem therefore is probably not a fusible link. But of course they're always a good thing to check.

You can get new ones at {gasp} the auto parts store, if you need them.

I'd suggest checking the voltage at each of the BIG RED wires that plug into the ign sw, and make sure there's 12V on them; then make sure there's 12V on the pink one where it also plugs into the sw when you turn the key to On.

"Shorting out the battery long ago" is highly unlikely to damage fusible links.
Reply
Old Aug 14, 2016 | 05:41 PM
  #4  
dragsta's Avatar
Thread Starter
Member
 
Joined: Aug 2012
Posts: 126
Likes: 0
From: florida
Car: 86 WS6 5sp TA
Engine: 305
Transmission: 5sp
Axle/Gears: posi
Re: Fusible Links

thanks for the lengthy reply.... to get to that ignition switch do i have to remove the steering wheel? i have no power at the wires to the coil.

Last edited by dragsta; Aug 14, 2016 at 06:08 PM.
Reply
Old Aug 14, 2016 | 06:13 PM
  #5  
paulo57509's Avatar
Supreme Member
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2000
Posts: 3,178
Likes: 48
From: Tracy, CA
Car: '87 IROC
Engine: LB9
Transmission: TH700R4
Re: Fusible Links

Originally Posted by dragsta
thanks for the lengthy reply.... to get to that ignition switch do i have to remove the steering wheel? i've not no power at the wires to the coil.
The ignition switch is screwed to the steering column under the dash.

The red wire is 12v going into the ignition switch.

The pink wire coming from the ignition switch feeds 12v to the coil with the key in the START/RUN position.
Reply
Old Aug 14, 2016 | 06:42 PM
  #6  
dragsta's Avatar
Thread Starter
Member
 
Joined: Aug 2012
Posts: 126
Likes: 0
From: florida
Car: 86 WS6 5sp TA
Engine: 305
Transmission: 5sp
Axle/Gears: posi
Re: Fusible Links

ok, thanks, will check it as you described tomorrow.
Reply
Old Aug 18, 2016 | 08:44 PM
  #7  
dragsta's Avatar
Thread Starter
Member
 
Joined: Aug 2012
Posts: 126
Likes: 0
From: florida
Car: 86 WS6 5sp TA
Engine: 305
Transmission: 5sp
Axle/Gears: posi
Re: Fusible Links

ok, i got under there and poked around but i don't know what is what. the manual says that the switch is on the brake mount and that i MUST drop the steering column but that doesn't look right. here's a pic of what i'm looking at.

THANKS!







Reply
Old Jul 19, 2023 | 08:17 AM
  #8  
AFatBunny7130's Avatar
Junior Member
 
Joined: Nov 2014
Posts: 1
Likes: 0
From: Pennsylvania
Car: 1987 Chevy Camaro IROC-Z
Engine: 5.7L, 350ci
Transmission: 700R4
Axle/Gears: Borg Warner 9 Bolt, 3.27
Re: Fusible Links

Originally Posted by dragsta
i'm pretty sure now that my no-start issue is a blown fusible link. i shorted out the battery when installing it long ago. it cranks but no juice to the coil. which fusible link is the prime suspect and where is it located?
Did you ever figure out what the issue was for this dragsta? I have the exact same issue where I am not getting 12V to the ignition coil. I took a look at my fusible links and they appear to look okay (not burnt or melted).

EDIT: I wasn't getting 12V to the pink wire that goes to the ignition coil because the purple wire on the small pole of the starter solenoid was loose. Once I tightened that up I was getting the 12V to the pink wire at the ignition coil.

Thanks!

Last edited by AFatBunny7130; Jul 24, 2023 at 10:21 AM. Reason: Adding additional important information
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
BRoss99
Electronics
28
Aug 10, 2025 05:08 PM
Bobby Shaw
Tech / General Engine
6
Jun 4, 2021 05:39 PM
88Camaro1993
Tech / General Engine
33
Jan 2, 2014 01:10 AM
UDAMON
Electronics
1
Jun 5, 2005 10:48 AM
KZad
Tech / General Engine
1
Dec 23, 2002 05:47 AM




All times are GMT -5. The time now is 02:04 PM.