• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

Fuse block

Z

Zedducus

Member
Local time
11:17 AM
Joined
Jul 8, 2021
Messages
7
Reaction score
6
Location
San Diego
Installed new harnesses on my 72 charger 318.
Only one I did not change was the steering column, my problem is the following on my fuse block the Accessories fuse has no power with the key on or off
When I try to start my car it does now , but only if I hold the key down As soon as I let go of the key it turns off. Would this have anything to do with it?
If not what can I do to keep my car running and idling?
 
welcome
 
could be the switch or the wiring at the bulkhead connector. Check both sides of the ballast resister with a VOM and the key on.
I would next check the connectors under the dash for voltage with the key on. Does the radio, turn signals work when in the run position. If you have voltage at the switch check both sides of the bulkhead connector.
 
69 Sleeper Bee said:
Welcome from North Florida.
Lets see some pictures of the Charger.
:xscuseless:
Click to expand...

574A165B-32C1-45C7-AC89-02DAD95397DA.jpeg A3BBDC61-2A53-4413-B8F4-1C5E77FBA3A5.jpeg
 
moes said:
could be the switch or the wiring at the bulkhead connector. Check both sides of the ballast resister with a VOM and the key on.
I would next check the connectors under the dash for voltage with the key on. Does the radio, turn signals work when in the run position. If you have voltage at the switch check both sides of the bulkhead connector.
Click to expand...
I’m thinking that’s what’s going on all my other fuses have power
 
Looks like you are headed in the right direction :thumbsup:
Good luck finding out your wiring issue.
Looks like you already got some good suggestions of what to try next.
 
it sounds as an ignition switch failure

Cabin power has nothing to do with engine bay power. If you are getting problems on both, is not likelly a firewall conector issue but an ignition switch issue... check the plug itself!!! Maybe could be just the connection and not the ign switch itself

With key RUN you should have power on:

Ign1 circuit which is blue wire on ign switch harness:
-Brake light on cluster ( if emergency brake is applied ) and oil light if standard cluster.
-ballast circuit ( blue side ), regulator blue wire, alt field blue wire and one of the ECU pins ( if elec ign )
-Coil brown wire... if ballast is good. Not full 12 volts but 5-9 volts

Acc circuit which is black wire on ign switch harness:
-Of course all the Acc side of fuse box, being able to turn on radio, apply turning lights, turn on wipers...

While cranking ( START )... brown wire on ign switch harness
-full 12 volts at coil
-dimmered power on the rest of the Ign1 circuit ( 5-9 volts ) as far ballast is good. You should be able to see the brake light on cluster dimmering out while cranking.
-No power at all on any ACC

also
-yellow wire from ign switch up to starter relay

knowing that you should be able to track down where is the fail
 
Welcome from Missouri!!
 
You must log in or register to reply here.

Similar threads

PurpleBeeper
Adding Electrical Circuits
Replies
11
Views
1K
493 Mike
493 Mike
67Survivor!
Where do I grab power for the electric fuel pump?
Replies
19
Views
1K
BB BELLA
BB BELLA
flamesoldier
Fuse block 1974 Roadrunner troubleshooting
Replies
14
Views
2K
Nacho-RT74
Nacho-RT74
S
Opinion american autowire fuse selection for main dash feed
Replies
2
Views
788
stubbygda
S
D
Need some help guys
2
Replies
25
Views
2K
72RoadrunnerGTX
72RoadrunnerGTX
Auto Transport Service
Back
Top