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Thread: Ignition switch getting hot

  1. #1
    LXi User InAccordance's Avatar
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    Jun 2010
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    1989 Accord LX Sedan / 2000 Accord EX v6
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    Ignition switch getting hot

    When I run the heater, after 5 mins or so, the ignition switch gets super hot, like it burnt my finger the other night.
    Yes, my switch is out because I lost the tiny bolts that hold it in, dont judge.
    I know why because it's running power through it to run the blower motor but it shouldn't be getting THAT hot..
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.



  2. #2

    Dr_Snooz's Avatar
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    Jun 2007
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    1989 Accord LX-i
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    Fresno, California
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    Re: Ignition switch getting hot

    It's almost always caused by wire gauges that are too small for the amperage they're carrying and/or wire connections with corrosion or too much resistance (bad crimp, inferior connectors, etc). Identifying the bad connection is pretty easy: just look for the one that's melted.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


    1989 Honda Accord LX-i Coupe, 240k miles, MT swap, rear disc swap

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  3. #3


    Join Date
    Nov 2004
    Vehicle
    88 LXi
    Location
    Knoxville TN
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    5,205

    Re: Ignition switch getting hot

    Quote Originally Posted by InAccordance View Post
    When I run the heater, after 5 mins or so, the ignition switch gets super hot, like it burnt my finger the other night.
    Yes, my switch is out because I lost the tiny bolts that hold it in, dont judge.
    I know why because it's running power through it to run the blower motor but it shouldn't be getting THAT hot..

    The heater blower is probably pulling alot of amps. Check the connector it might be toasted and or blow out the area where the brushes are for the motor might help bring the amp draw down. It is fused very very high and should not be. I replaced my connector and an inline 20 amp fuse.

    EDIT:

    Went thru the prints from the 1988 HELMS book 26-18. Double check my readings.

    40A(fuse22)----wht/blk-----IG2(B)------blu/wht------blower motor

    IG2(b) is a post on the ignition switch itself.
    Last edited by Oldblueaccord; 12-23-2019 at 07:37 AM.
    1988 Lxi owner since August 1995
    336k miles running strong!
    Now running E85.

    Oldblueaccord <<< MY YOUTUBE PAGE!

  4. #4
    LXi User InAccordance's Avatar
    Join Date
    Jun 2010
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    1989 Accord LX Sedan / 2000 Accord EX v6
    Posts
    967

    Re: Ignition switch getting hot

    Makes sense, had replaced the blower motor last year. One I got came off an 88 so I dont see why it would cause a problem but I'll check it out. Thank you both.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

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