Fusible link

[woodrow]

I keep blowing the fusible link at solinoid , leaves truck powerless. I changed it out for a 30 A glass fuse so I can fix on the run. It happens intermittently.
Is this a common issue that someone can advise where to look. Harnesses are un molested

[440sixpack]

It shouldn't be happening, you have a real problem. unless you have some serious add ons drawing juice then you have a short going to ground somewhere.




If it were me I'd disconnect the battery when not in use until you find the problem. I do that on all my old rigs anyway.

[scout4bta]

Or you have a high resistance some where in the circuit.
When you have high resistance voltage goes down and current goes up.

[tgreese]

The fusible link is meant to protect the car from a shorted battery in case of a wreck or other catastrophe. If you are blowing the fusible link, you have a serious short to ground somewhere.

Year, model?

[woodrow]

I don't have any add ons , I figured it must be a short to ground.

could the short causing it to blow be anywhere in the vehicle or is that link localized to a certain loop

finding shorts not my strength

[woodrow]

89 grand wagoneer

[tgreese]

There is a wiring diagram for an '88 here. http://oljeep.com/gw/elec/GW_wiring.html No '89 - you need the TSM for 1989. Available on CD-RM from ROckAuto. https://www.rockauto.com/en/moreinfo...182372&jsn=365 The '88 diagram is likely the same, and shows 4 fusible links. Which one is the problem?



From the link, start tracing forward with your multimeter until you find the short.

[woodrow]

Perfect, I have a plan

Thanks

[woodrow]

OK 1 more question

Would any of those links render the vehicle dead, won't run

[tgreese]

Sure, the one to D4 would cut ignition power. I suspect that powers the whole dash.
I left out the link to the '88 diagram. Fixed now.

[woodrow]

What does D4 represent

[tgreese]

Don't know. It's a label, not a thing - should not let it throw you off. It may be described in the text that goes along with the diagram. I suspect that diagram was copied from a Hayne's or Chilton's manual, not the TSM.

[woodrow]

Awesome, Thanks again

[wiley-moeracing]

d-4 most likely is location in firewall connector

[Woodchomper]

woodrow....I'm not so sure I would trust a 30A glass fuse in your application. Most glass fuses are fast-blow fuses. You might be better off using a 30A circuit breaker while you are isolating your problem. At least then if blows your vehicle run once the circuit cools off and resets itself.

Also, if you post the year of your Jeep it may help others to help you out.

I would stick to using the TSM (for your year) to do the wiring troubleshooting.