AM radio dealer option wiring

[cims1970fj40]

I have a 74 fj40 with a dealer AM radio and have a question on the wiring. I have a short blue with no stripes from what I can see coming out of the harness. The wire isn’t long enough to reach the radio and was curious if there’s supposed to be a jumper between the wire coming from the harness to the back of the radio are if my harness isn’t in the correct position to plug it in as is. Any help are photos would be great. Thanks

 

[cims1970fj40]

some pictures

 

[charliemeyer007]

Small black oval circle look like the ground tab for the cig lighter. Maybe up a jumper wire with a small value fuse to connect your blue wire connector to the radio after you see it has +12V power. Turn on radio - your small value fuse could blow due to actual radio requirement - increase value up to what the real fuse value. If it works - Spice in an extension.

Does cig lighter work. No- add a wire to the tab to a good ground. Yes, well the mount could be providing the ground. The tab could be an additional ground in case the mount was in like fiberglass.

 

[cims1970fj40]

Haven’t tried the cigarette lighter yet but might tonight. Thanks for the reply.

 

[Engineer8000]

I think the 74 radio was powered from the wiper fuse. It could be that whoever re-wrapped the harness wrapped the radio plug further along that it should have been. If you can confirm that blue wire is on the wiper fuse it would be easy enough to make up a short jumper. That particular connector housing is not correct for the radio, that is for connecting to a stud like the brake pressure switches or the oil pressure sender.

 

[cims1970fj40]

I think the 74 radio was powered from the wiper fuse. It could be that whoever re-wrapped the harness wrapped the radio plug further along that it should have been. If you can confirm that blue wire is on the wiper fuse it would be easy enough to make up a short jumper. That particular connector housing is not correct for the radio, that is for connecting to a stud like the brake pressure switches or the oil pressure sender.

@Coolerman is the one who went through my harness a few years ago. Also is that not the correct connector for that particular radio?

 

[charliemeyer007]

Not a purest. That slot looks like it fits a button head contact. Temp sensor or oil pressure sender on my rig had that type of connector - note had.

 

[Engineer8000]

x2

The connectors are very different. The button head connector will slide on the radio power tab and probably work ok but technically is not correct.

 

[cims1970fj40]

x2

The connectors are very different. The button head connector will slide on the radio power tab and probably work ok but technically is not correct.

View attachment 3710592

View attachment 3710590

I guess I could make a jumper with the correct connector on the end that will attach to the radio. The other question is how do I determine if it is running off the wiper fuse?

 

[charliemeyer007]

Pull the wiper fuse and see if it still works.

 

[cims1970fj40]

Pull the wiper fuse and see if it still works.

I feel like a dumb ass. Lol

 

[charliemeyer007]

Way safer to ask, than to let out the magic smoke and burn down the rig plus your house.

 

[cims1970fj40]

Way safer to ask, than to let out the magic smoke and burn down the rig plus your house.

Yeah that would be hard to explain to wife why the house caught on fire for a vehicle she doesn’t care for.

 

[Engineer8000]

I was looking for something else this morning and ran across this in the archives. This is from the 74 FSM showing a blue wire to the optional radio.

 

[cims1970fj40]

I was looking for something else this morning and ran across this in the archives. This is from the 74 FSM showing a blue wire to the optional radio.

View attachment 3713656

Thanks for sharing that! So know I just need to make a jumper. Also do you have are do repairs on speakers? OEM that is

 

[Engineer8000]

Are you talking cone repairs?

 

[cims1970fj40]

Just any repairs that can be done on one in general. I currently don’t have one but will be looking soon.

 

[cims1970fj40]

Just any repairs that can be done on one in general. I currently don’t have one but will be looking soon.

@Engineer8000

 

[Engineer8000]

Re-coning these old speakers is a gamble. Small tears can be repaired. Beyond that, not much can be done.

 

[Engineer8000]

I did this one a while back for my truck. The voice coil wires are very small and delicate. Post 182

Cape Fear Electronics

Great work, fellas like you are few and far between! Now I know who to send anything electrical to when it is out of my realm.

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