I have a 94 yj automatic transmission with. 4.0l 6-cyl engine. A dealership fried my wiring harness by using a 60-amp fuse where a 30 amp should have been but I can’t prove it. I was able to find a working harness from a manual transmission Jeep but I do not know if it can be adapted to work in my automatic. Any guidance would be so greatly appreciated.
Help with engine harness
- Thread starter emusers
- Start date
Show us the 60A where you’re talking about. That might not be an issue.
What harness will work depends on which harness you’re talking about. Are you talking about the one with the PDC and firewall bulkhead connector on it? Or are you talking about the engine harness that plugs into the PDC harness and runs out to the fuel pump, Speedo gear, and all of the engine components?
What harness will work depends on which harness you’re talking about. Are you talking about the one with the PDC and firewall bulkhead connector on it? Or are you talking about the engine harness that plugs into the PDC harness and runs out to the fuel pump, Speedo gear, and all of the engine components?
The fuse was in the engine working harness and was for the fuel pump. That’s what kept blowing but I personally believe that after they replaced the fuel pump, they put a 60 amp fuse in because they used the last one on my jeep and it blew. The part what has all the melted wires is the section coming out of the engine fuse box. They seem to be burnt up for about a foot. I hope that helps explain things.
Hard to say what may have caused that, there have been multiple people over the years with fires from that fuse box area and nobody really knows why. I’d guess aftermarket added junk contribute but no one really knows.
That harness is the firewall bulkhead harness which has the automatic transmission torque converter lockup on it, since you have a 94. This means you’ll need a harness from any 94-95. You don’t need the engine portion, your engine harness will plug into whatever you buy.
The bad part is that most people lost the whole engine plus firewall harness as one giant engine harness which is technically incorrect and will get you more than you need for more money than necessary. But that might be what you have to buy to get what you need.
As long as you get the harness with the long rectangular relay box and it’s 94-95 so it has the torque converter relay, you’ll be fine. That harness just runs from the relay box, up to the firewall, across the firewall and plugs into the bulkhead connector with a bolt. It hands off to the engine harness at one connector at the firewall, and one connector near the battery/distributor along with an alternator charge cable.