HP
Enthusiast
In the past I had posted a problem(apparently only I have)
with the fan circuit overheating when the hi-speed fan relay
kicks in. Before the 99 fan was installed I had no problem,
with circuit, or car overheating(Just thought it was a good upgrade). On my car instead of a fusible link, someone had
installed a 30amp fuse, so when I started blowing fuses, I
realized the circuit was taking a high load amp hit(fuses actually melted and wire was hot). The circuit for later cars
has been changed for the better, but for my 96 RT, that circuit
has to circle the engine bay(relays on passenger side) to get
back to the fan. Researching the subject I found a few posts
from Sean Roe & JohnB on the initial amp draw of the hi-speed
fan(~50amp) leveling off to 25amp. 30amp rated fusible links and circuit breakers can handle the surge, but 30amp fuses can't, that could be why I'm the only one with all the variables to realize the problem. To me the circuit is too important
to reinstall a fusible link(this circuit also has 2 relays, and
operates the AC clutch) so I installed a separate circuit just
for the fan hi-speed. I cut the power supply to the hi-speed
and used that to power the relay, making the wiring
simpler(rather than using the ground switch from the original
hi-speed relay). While I was at it, I used the 'mystery switch' to activate another parallel relay, so I could manually turn on the hi-speed fan. Hi-speed is awesome, with my car off and the fan on, the whole car vibrates. I used a plug in 30amp circuit breaker, which worked just fine(40amp fuse might work)
This modification was, my solution, to a problem I had, and
not intended to be a mod for anything other than that.
with the fan circuit overheating when the hi-speed fan relay
kicks in. Before the 99 fan was installed I had no problem,
with circuit, or car overheating(Just thought it was a good upgrade). On my car instead of a fusible link, someone had
installed a 30amp fuse, so when I started blowing fuses, I
realized the circuit was taking a high load amp hit(fuses actually melted and wire was hot). The circuit for later cars
has been changed for the better, but for my 96 RT, that circuit
has to circle the engine bay(relays on passenger side) to get
back to the fan. Researching the subject I found a few posts
from Sean Roe & JohnB on the initial amp draw of the hi-speed
fan(~50amp) leveling off to 25amp. 30amp rated fusible links and circuit breakers can handle the surge, but 30amp fuses can't, that could be why I'm the only one with all the variables to realize the problem. To me the circuit is too important
to reinstall a fusible link(this circuit also has 2 relays, and
operates the AC clutch) so I installed a separate circuit just
for the fan hi-speed. I cut the power supply to the hi-speed
and used that to power the relay, making the wiring
simpler(rather than using the ground switch from the original
hi-speed relay). While I was at it, I used the 'mystery switch' to activate another parallel relay, so I could manually turn on the hi-speed fan. Hi-speed is awesome, with my car off and the fan on, the whole car vibrates. I used a plug in 30amp circuit breaker, which worked just fine(40amp fuse might work)
This modification was, my solution, to a problem I had, and
not intended to be a mod for anything other than that.
