how do I check the solenoids/relays on a 1991 chevrolet blazer

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Clarification of Question by brettsk5-ga on 22 Oct 2003 18:04 PDT

I just replaced my computer. Something was/is causing it to blow fuses
when i get on the accelerator after it warms up. the computer came
with a warning that I should check all solenoids/relays that they
should be all 20 ohms or it would destroy my computer. do you know
anything regaurding this subject. I do not know the difference between
in circit or out but I would like to know.

Which solenoids/relays do you want to check?  Do you want to know how
to check them out of the circuit or in the circuit?

I just replaced my computer. Something was/is causing it to blow fuses
when i get on the accelerator after it warms up. the computer came
with a warning that I should check all solenoids/relays that they
should be all 20 ohms or it would destroy my computer. do you know
anything regaurding this subject. I do not know the difference between
in circit or out but I would like to know.

I don't claim to be an expert, but I'll try to help.  Solenoids and
relays both have a coil of wire in them.  The DC resistance of the
coil can be measured with an ohm meter.  I am guessing you had a
generic aftermarket computer installed and they want to make sure you
don't use it on an automobile which has solenoids and relays with a DC
resistance less than 20 ohms.  You would have to have an electrical
shop check one or more of your solenoids and relays with an ohm meter
to make sure they are 20 ohms or more.  It will be okay if they are
more than 20 ohms, but bad news if they check less than 20 ohms.

It sounds a bit redneckish...but don't knock it till you try it.  Take
a screwdriver and place it between the ground screw and the
hot(positive) screw used to connect the wires to the solenoid(while
the engine is off and the key is on). This will temporarily roll the
motor over and reestablish a solid circuit within the solenoid itself.
You are experiencing a condition called" Tripics", which is the
solisisty of the current being over-powered by the voltage in the
battery. That should do the trick..