Experiencing electrical failure - ZR-1 Net Registry Forums

Pete · 09-13-2008

If your only getting 12.2 volts with it running sounds like the alternator.
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Pete

IowaZR-1 · 09-14-2008

it can be done without a plenum pull......been there.......done that....can't remember for sure but you might have to pull the pulley off...if so make a special wrench to put it back on....weld a 16 inch long 1/2 bar to a socket on the side leaving the hole open thru it....an allen wrench will fit thru to hold the shaft as you tighten the nut

Shinto · 09-14-2008

Without pulling the plenum, will it come out from the side or the front? Trying to plan the route with a minimum amount of disassembly. I noticed the plenum dips downward just ahead of the alternator, but there are a couple of sensors, vacuum lines, and possibly the oil fill cap and filter in the way to the side. The coolant line is in the way in either direction. Gonna be fun...

IowaZR-1 · 09-14-2008

Quote:

Originally Posted by Shinto

Without pulling the plenum, will it come out from the side or the front? Trying to plan the route with a minimum amount of disassembly. I noticed the plenum dips downward just ahead of the alternator, but there are a couple of sensors, vacuum lines, and possibly the oil fill cap and filter in the way to the side. The coolant line is in the way in either direction. Gonna be fun...

I just looked at the service manual to refresh how it comes out...it comes out the front....remove negative battery cable...air horn and duct...alternator pulley and fan...and a couple of brackets(upper and lower)...the bolts are different lengths so label them or keep them straight some way...the rear brace...oil pressure sender(may need a special socket for this)... and the battery and regulator connections...good luck!

Shinto · 09-15-2008

Well, I got it apart, but took a slightly different route. Disconnect battery power, oil pressure sender (used a 1-1/16" open end wrench and it fit fine), the air temp sensor on the side of the air horn and whatever sensor that is on the side of the throttle body, the coolant tube alongside the motor, the belt, intake hose, air horn and then the throttle body. Slid right out with room to spare. No need to wrestle with the pulley and fan and make a special tool. The rear support could stay put too (especially since I couldn't get the bolt out of the hole past the front #2 cyl injector). Of course I'll be cutting new gaskets for the throttle body and coolant tube for the next hour or so but... I think I might just get this thing done tonight.

It's a far cry from changing the alternator on my '78 T/A -- that only takes about 3-4 minutes and 2 open end wrenches...

As a side note, did any of you notice there are small coolant passages in the top of the plenum and into the top of the throttle body? Obviously there for smog, but closing these off may net a couple of easy horses...

09-13-2008	#1
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,667	Re: Experiencing electrical failure If your only getting 12.2 volts with it running sounds like the alternator. Myrray's Auto Parts Autolite #A145761 $112 + $18 core Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage

09-14-2008	#3
Shinto Join Date: Oct 2007 Location: Sacramento, CA Posts: 16	Re: Experiencing electrical failure Without pulling the plenum, will it come out from the side or the front? Trying to plan the route with a minimum amount of disassembly. I noticed the plenum dips downward just ahead of the alternator, but there are a couple of sensors, vacuum lines, and possibly the oil fill cap and filter in the way to the side. The coolant line is in the way in either direction. Gonna be fun...

09-15-2008	#5
Shinto Join Date: Oct 2007 Location: Sacramento, CA Posts: 16	Re: Experiencing electrical failure Well, I got it apart, but took a slightly different route. Disconnect battery power, oil pressure sender (used a 1-1/16" open end wrench and it fit fine), the air temp sensor on the side of the air horn and whatever sensor that is on the side of the throttle body, the coolant tube alongside the motor, the belt, intake hose, air horn and then the throttle body. Slid right out with room to spare. No need to wrestle with the pulley and fan and make a special tool. The rear support could stay put too (especially since I couldn't get the bolt out of the hole past the front #2 cyl injector). Of course I'll be cutting new gaskets for the throttle body and coolant tube for the next hour or so but... I think I might just get this thing done tonight. It's a far cry from changing the alternator on my '78 T/A -- that only takes about 3-4 minutes and 2 open end wrenches... As a side note, did any of you notice there are small coolant passages in the top of the plenum and into the top of the throttle body? Obviously there for smog, but closing these off may net a couple of easy horses...

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09-14-2008	#2
IowaZR-1 Join Date: Feb 2006 Location: Iowa aka "one big cornfield" Posts: 339	Re: Experiencing electrical failure it can be done without a plenum pull......been there.......done that....can't remember for sure but you might have to pull the pulley off...if so make a special wrench to put it back on....weld a 16 inch long 1/2 bar to a socket on the side leaving the hole open thru it....an allen wrench will fit thru to hold the shaft as you tighten the nut Last edited by IowaZR-1; 09-14-2008 at 10:29 AM.