crank fuse keeps poping
Thread Starter
Junior Member
Joined: Apr 2012
Posts: 54
Likes: 0
From: saint johns,az
Car: 1984 camaro
Engine: 305 v8
Transmission: auto 4 speed
crank fuse keeps poping
ok so i have an 84 camaro 5.0 and at night when i turn turn on my lights sometmes a fuse pops and all my rear lights go out, well when i checked it is my crank fuse that pops and i was wondering if anyone knew why it would be the one that takes out my rear end and what it does
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Cruisin’ For A Fusin’
The CRANK fuse protects part of the Airbag System, and part of the ECM.
Make sure your TAIL fuse is no more than 20 amps.
Make sure the Fuse Block has not been messed with by the PO.
Look for amateurish or sloppy wiring near the Fuse Block.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing !
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Don’t Blame Me For Spinning Him, My Car Simply Took The Air Off His Spoiler
Make sure your TAIL fuse is no more than 20 amps.
Make sure the Fuse Block has not been messed with by the PO.
Look for amateurish or sloppy wiring near the Fuse Block.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing !
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Don’t Blame Me For Spinning Him, My Car Simply Took The Air Off His Spoiler
Joined: Aug 1999
Posts: 5,256
Likes: 458
From: RI
Car: 1984 Camaro Berlinetta
Engine: LT1
Transmission: T56 6-speed
Axle/Gears: 4.11 LS1 Rear End
Re: crank fuse keeps poping
Got a factory Electric fuel pump ??
Was the car originally an Iron duke ?
Are you SURE it's an 84 ?? ( have to ask ! )
Engine swap ?
Harness swap ??
On 'iron duke' Thirdgens the HOT wire leading to the CRANK fuse is factory spliced off the purple starter wire. When the key is turned to RUN the fuse accepts voltage and passes it thru to the ECM ( only while key is turned to RUN ).
If your car is/was originally an 'HO' than it probably got/had an factory electric fuel pump. If the CRANK fuse is blowing than it could be the purple wire from the Starter Solenoid to the CRANK fuse ( passes thru C100),...... the purple wire from the CRANK fuse to the Fuel Pump Relay (passes out thru C207),........the Relay itself could have failed,........ or; the TAN/WHITE wire leading from the Relay to the fuel tank ( passes back in thru C207 ) could be touching body ground somewhere.
Mid-eighties Fuel Injected cars used the CRANK fuse to feed the cold start injector. During 90-92 the CRANK fuse was still sending voltage to the ECM - and as NINA says - it was factory spliced and feeds power to the Air Bag DERM during 'start-up'.
84 Camaro: ( Pin B4 )
85 Camaro C207:
PIN Color From / To (Notes)
A Brn ALDL (pin C) / ECM (AIR control)
B* Dk Blue BU Fuse / Back Up Switch ( V8 T5 )
B* Red ALDL / Fuel Relay ( V6 - TPI )
B* Org/Blk FP FUSE / Fuel Relay ( L4 )
C* Brn/Wht ECM / CE Light ( L4- V6 - TPI )
C* Wht/Grn Light Driver / ECM ( LG4 & L69 )
D* Blk/Org FP/INJ fuse / Fuel Relay ( L69 )
D* Tan/Wht Fuel Relay / Fuel Pump ( V6 )
D* Lt Blue Fuel Relay / Fuel Pump ( TPI )
D* Tan Oil Pr Sensor / Oil Pr Gauge ( L4 )
E Wht/Blk ALDL / ECM (test)
F Pnk/Blk IGN fuse / EGR-ECM
G* Dk Blue BU Fuse / Back Up Switch ( V8 T5 )
G* Pnk/Blk Gage Fuse / MAF Relay ( V6)
G* Pnk/Blk Gage Fuse / Burn Off Relay ( TPI )
G* Pnk/Blk Gage Fuse / Air Cond Relay ( L4 )
H Tan/Blk ALDL / TCC-ECM
J* Ppl Starter / Fuel Relay ( L69 )
J* Org ALDL / ECM ( L4 - TPI )
K Brn ECM / VSS
L Tan/Wht Fuel Relay / Fuel Pump ( L4 - L69 )
M Blk/Wht VSS,P/N switch / Grd
N Org/Blk ECM / P/N switch
P Ppl Brake / TCC
R Ppl/Wht Crank Fuse / Cold Start-ECM ( V6-L4 )
The CRANK fuse is ( should not be ) related to the lighting in ANY way. It's only purpose is to 'signal' various electrical parts that you turned the key to RUN.
Was the car originally an Iron duke ?
Are you SURE it's an 84 ?? ( have to ask ! )
Engine swap ?
Harness swap ??
On 'iron duke' Thirdgens the HOT wire leading to the CRANK fuse is factory spliced off the purple starter wire. When the key is turned to RUN the fuse accepts voltage and passes it thru to the ECM ( only while key is turned to RUN ).
If your car is/was originally an 'HO' than it probably got/had an factory electric fuel pump. If the CRANK fuse is blowing than it could be the purple wire from the Starter Solenoid to the CRANK fuse ( passes thru C100),...... the purple wire from the CRANK fuse to the Fuel Pump Relay (passes out thru C207),........the Relay itself could have failed,........ or; the TAN/WHITE wire leading from the Relay to the fuel tank ( passes back in thru C207 ) could be touching body ground somewhere.
Mid-eighties Fuel Injected cars used the CRANK fuse to feed the cold start injector. During 90-92 the CRANK fuse was still sending voltage to the ECM - and as NINA says - it was factory spliced and feeds power to the Air Bag DERM during 'start-up'.
84 Camaro: ( Pin B4 )
85 Camaro C207:
PIN Color From / To (Notes)
A Brn ALDL (pin C) / ECM (AIR control)
B* Dk Blue BU Fuse / Back Up Switch ( V8 T5 )
B* Red ALDL / Fuel Relay ( V6 - TPI )
B* Org/Blk FP FUSE / Fuel Relay ( L4 )
C* Brn/Wht ECM / CE Light ( L4- V6 - TPI )
C* Wht/Grn Light Driver / ECM ( LG4 & L69 )
D* Blk/Org FP/INJ fuse / Fuel Relay ( L69 )
D* Tan/Wht Fuel Relay / Fuel Pump ( V6 )
D* Lt Blue Fuel Relay / Fuel Pump ( TPI )
D* Tan Oil Pr Sensor / Oil Pr Gauge ( L4 )
E Wht/Blk ALDL / ECM (test)
F Pnk/Blk IGN fuse / EGR-ECM
G* Dk Blue BU Fuse / Back Up Switch ( V8 T5 )
G* Pnk/Blk Gage Fuse / MAF Relay ( V6)
G* Pnk/Blk Gage Fuse / Burn Off Relay ( TPI )
G* Pnk/Blk Gage Fuse / Air Cond Relay ( L4 )
H Tan/Blk ALDL / TCC-ECM
J* Ppl Starter / Fuel Relay ( L69 )
J* Org ALDL / ECM ( L4 - TPI )
K Brn ECM / VSS
L Tan/Wht Fuel Relay / Fuel Pump ( L4 - L69 )
M Blk/Wht VSS,P/N switch / Grd
N Org/Blk ECM / P/N switch
P Ppl Brake / TCC
R Ppl/Wht Crank Fuse / Cold Start-ECM ( V6-L4 )
The CRANK fuse is ( should not be ) related to the lighting in ANY way. It's only purpose is to 'signal' various electrical parts that you turned the key to RUN.
Thread Starter
Junior Member
Joined: Apr 2012
Posts: 54
Likes: 0
From: saint johns,az
Car: 1984 camaro
Engine: 305 v8
Transmission: auto 4 speed
Re: crank fuse keeps poping
it is an 84, not an iron duke, manual fuel pump, Carbureted, the engine was switched out on 99 but replaced with another 5.0 because the last one blew. it isnt an ho
Joined: Aug 1999
Posts: 5,256
Likes: 458
From: RI
Car: 1984 Camaro Berlinetta
Engine: LT1
Transmission: T56 6-speed
Axle/Gears: 4.11 LS1 Rear End
Re: crank fuse keeps poping
If it's a V8 carb WITHOUT an electric fuel pump - it should not have a CRANK fuse.
If the car was originally an HO ( Engine code ?? ) you might still have an electric pump in the tank - or perhaps just the wiring for it.
If the car was originally an HO ( Engine code ?? ) you might still have an electric pump in the tank - or perhaps just the wiring for it.
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