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Old September 23rd, 2011, 10:56 PM   #1
CHEROKEEMUDMAN01
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Default electrical help with relays please

i been going through my harness in my 89 jeep cherokee which i swaped a 318 in it and used a 80's style electronic ignition system in it. most everything i have had to hook up needs key on power which is the yellow wire in my jeep and is either 14 or 16 gauge. i am concerned with my original way i hooked it up using that wire for so many things( it did work and ran fine so far). here is what is being ran on that yellow wire
tach power
relay on power for electric fans
choke power for carb
ballist resistor
mopar electronic ingition box.
my thought to fix this prob since it is the only key on power wire in motor compartment is to run a relay of some kind to reduce the strain on that wire but my knowledge is very limited as to wiring and dont really have a 4 or 5 prong relay wire diagram.
so if anyone has one i would really appreciate the help.
also anyone see a prob with having a relay before the ignition box and ballist resistor
and where should i connect voltage regulator before relay or after relay?
thanks to anyone who can set me into right direction.
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Old September 23rd, 2011, 11:25 PM   #2
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most of those things running are using very low power. Run an inline fuse with a 15a fuse in it and see if it blows. or test the amperage with a meter. Either way It will tell you how much power you use.

tach, relay for fans, choke power, and the on switch circuit for the ignition don't use much power at all. not to familiar with the ballist resistor
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Old September 23rd, 2011, 11:35 PM   #3
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ok i know wire for the ballist resistor gets warm when i leave key on but truck isnt running. i thought about putting a 30 amp relay in just for the mopar ingition box and ballist resistor and leaving rest alone. any thoughts on this
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Old September 23rd, 2011, 11:48 PM   #4
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that will work fine. a 14 gauge wire handles alot of power

edit: 14 awg wire is rated for 32 amps (alot of power)
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Old September 24th, 2011, 01:40 AM   #5
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14 gauge wire is only rated for 15amps.

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Old September 24th, 2011, 09:15 AM   #6
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so should a relay to lighten the load on the 14 gauge wire affect the ballist resistor and ingition box?
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